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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 23, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	HAIR
Entity Registrant Name	Restoration Robotics, Inc.
Entity Central Index Key	0001409269
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		40,676,012

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 23,609	$ 23,545
Accounts receivable, net of allowance of $839 and $229 as of September 30, 2018 and December 31, 2017, respectively	6,441	3,864
Inventory	4,446	2,761
Prepaid expenses and other current assets	1,502	1,562
Total current assets	35,998	31,732
Property and equipment, net	1,556	1,138
Restricted cash	83	100
Other assets	100
TOTAL ASSETS	37,737	32,970
CURRENT LIABILITIES:
Accounts payable	3,947	2,044
Accrued compensation	1,423	1,630
Other accrued liabilities	1,671	1,125
Deferred revenue	1,449	1,517
Current portion of long-term debt, net of discount of $270 as of December 31, 2017		7,730
Total current liabilities	8,490	14,046
Other long-term liabilities	558	459
Long-term debt, net of discount of $1,454 and $29 as of September 30, 2018 and December 31, 2017	19,376	5,271
TOTAL LIABILITIES	28,424	19,776
Commitments and Contingencies (Note 6)
STOCKHOLDERS’ EQUITY:
Common stock, $0.0001 par value; 300,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 40,676,012 and 28,940,282 shares issued and outstanding as of September 30, 2018 and December 31, 2017	4	3
Additional paid-in capital	194,586	177,757
Accumulated other comprehensive loss	(46)	(79)
Accumulated deficit	(185,231)	(164,487)
TOTAL STOCKHOLDERS’ EQUITY	9,313	13,194
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 37,737	$ 32,970

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 839	$ 229
Current portion of long-term debt, discount		270
Long-term debt, discount	$ 1,454	$ 29
Convertible preferred stock at liquidation preference par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares authorized	10,000,000	10,000,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	40,676,012	28,940,282
Common stock, shares outstanding	40,676,012	28,940,282

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 4,818	$ 4,177	$ 15,298	$ 15,441
Cost of revenue	2,663	2,474	8,362	9,053
Gross profit	2,155	1,703	6,936	6,388
Operating expenses:
Sales and marketing	4,398	3,433	13,147	10,736
Research and development	2,008	1,737	6,286	5,579
General and administrative	2,191	1,139	6,159	3,549
Total operating expenses	8,597	6,309	25,592	19,864
Loss from operations	(6,442)	(4,606)	(18,656)	(13,476)
Other expense, net:
Interest expense	(631)	(492)	(1,489)	(1,607)
Other income (expense), net	12	(1,473)	(567)	(1,646)
Total other expense, net	(619)	(1,965)	(2,056)	(3,253)
Net loss before provision for income taxes	(7,061)	(6,571)	(20,712)	(16,729)
Provision for income taxes	8	25	32	50
Net loss attributable to common stockholders	$ (7,069)	$ (6,596)	$ (20,744)	$ (16,779)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.20)	$ (4.07)	$ (0.67)	$ (10.36)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	35,007,299	1,620,691	31,054,837	1,620,016

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (7,069)	$ (6,596)	$ (20,744)	$ (16,779)
Other comprehensive income (loss):
Cumulative translation adjustment	(9)	26	33	(22)
Comprehensive loss	$ (7,078)	$ (6,570)	$ (20,711)	$ (16,801)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance, value at Dec. 31, 2017	$ 13,194	$ 3	$ 177,757	$ (79)	$ (164,487)
Beginning balance, shares at Dec. 31, 2017		28,940,282
Issuance of common stock pursuant to stock option exercises of vested options	$ 392		392
Issuance of common stock pursuant to stock option exercises of vested options, shares	235,730	235,730
Stock-based compensation	$ 419		419
Issuance of common stock warrants pursuant to debt financing	404		404
Issuance of common stock in connection with our follow-on offering, net of underwriters' commission and offering costs of $1,635	15,615	$ 1	15,614
Issuance of common stock in connection with our follow-on offering, net of underwriters' commission and offering costs of $1,635, shares		11,500,000
Other comprehensive gain	33			33
Net loss	(20,744)				(20,744)
Ending balance, value at Sep. 30, 2018	$ 9,313	$ 4	$ 194,586	$ (46)	$ (185,231)
Ending balance, shares at Sep. 30, 2018		40,676,012

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Statement Of Stockholders Equity [Abstract]
Underwriters' commission and offering costs	$ 1,635

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (20,744)	$ (16,779)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	539	452
Amortization of debt issuance costs	318	440
Non-cash loss on extinguishment of debt	178
Stock-based compensation	419	349
Changes in fair value of preferred stock warrant liabilities		1,618
Provision for bad debt	839
Changes in excess and obsolete inventory	(55)
Loss on disposal of property and equipment	41	34
Changes in operating assets and liabilities:
Accounts receivable	(3,417)	(741)
Inventory	(1,631)	65
Prepaid expenses and other assets	(40)	(2,272)
Accounts payable	1,956	1,194
Accrued and other liabilities	253	1,249
Deferred revenue	118	15
Net cash used in operating activities	(21,226)	(14,376)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,051)	(215)
Net cash used in investing activities	(1,051)	(215)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from convertible notes, net		5,000
Proceeds from issuance of Series C convertible preferred stock, net		10,209
Proceeds from exercised stock options	392	16
Payment of deferred offering costs		(749)
Proceeds from follow-on offering, net	15,615
Proceeds from long-term debt, net	19,584
Principal payments on long-term debt	(13,300)	(6,000)
Net cash provided by financing activities	22,291	8,476
Effect of exchange rate changes on cash, cash equivalents and restricted cash	33	(22)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	47	(6,137)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	23,645	11,906
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	23,692	5,769
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	35	4
Interest paid during the period	1,240	1,185
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Purchase of property and equipment included in accounts payable	4
Discounts and issuance costs in connection with long-term debt	1,246
Issuance of warrants in connection with long-term debt	404
Deferred offering costs included in accounts payable and accrued liabilities	$ 121	$ 1,474

Nature of Operations	9 Months Ended
Nature of Operations	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	1. Nature of Operations Restoration Robotics, Inc. is a medical technology company incorporated in the state of Delaware on November 22, 2002 and headquartered in San Jose, California. The Company develops an image-guided robotic system that enables follicular unit extraction (FUE) for use in the field of hair transplantation and markets the ARTAS^® Robotic System in the United States and other countries. In these notes to the unaudited condensed consolidated financial statements, the “Company,” “Restoration Robotics,” “we,” “us,” and “our” refers to Restoration Robotics, Inc. and its subsidiaries on a consolidated basis. Initial Public Offering On October 11, 2017, the Company’s Registration Statement on Form S-1 (File No. 333-220303) relating to the initial public offering (IPO) of its common stock was declared effective by the Securities and Exchange Commission (SEC). Pursuant to such Registration Statement, the Company completed its IPO of 3,897,910 shares of its common stock (inclusive of 322,910 shares of common stock from the subsequent exercise of the over-allotment option granted to the underwriters) at a price of $7.00 per share for aggregate cash proceeds of approximately $22,114, after deducting underwriting discounts and commissions, and offering costs totaling $5,171. Immediately prior to the closing of the IPO, all outstanding shares of convertible preferred stock converted into 22,671,601 shares of common stock and all the outstanding convertible preferred stock warrants converted into common stock warrants resulting in the reclassification of our preferred stock warrant liabilities to additional paid-in capital. In addition, the principal and accrued interest on the outstanding Convertible Notes converted into 718,184 shares of common stock. The IPO closed on October 16, 2017. Follow-on Public Offering On August 16, 2018, the Company closed its follow-on public offering of 10,000,000 shares of its common stock, plus 1,500,000 shares of common stock from the subsequent exercise of the over-allotment option granted to the underwriters. The public offering price of the shares sold was $1.50 per share. The Company received aggregate proceeds of approximately $15.6 million from the follow-on offering, after deducting underwriting discounts and commissions and offering costs totaling $1.6 million. The Company intends to use the net proceeds from this offering (including net proceeds from the underwriters’ exercise of their option to purchase additional shares of common stock) to fund expanded commercialization activities in connection with our recently launched ARTAS^® iX System and for working capital and general corporate purposes. Reverse Stock Split On September 15, 2017, the Company effected a 1-for-10 reverse stock split of its common stock. Upon the effectiveness of the reverse stock split, (i) every 10 shares of outstanding common stock were combined into one share of common stock, (ii) the number of shares of common stock for which each outstanding option to purchase common stock is exercisable was proportionately decreased on a 1-for-10 basis, (iii) the exercise price of each outstanding option to purchase common stock was proportionally increased on a l-for-10 basis, and (iv) the conversion ratio for each share of outstanding preferred stock which is convertible into our common stock was proportionately reduced on a 1-for-10 basis. All of the outstanding common stock share numbers (including shares of common stock into which our outstanding convertible preferred stock shares are convertible), share prices, exercise prices and per share amounts have been adjusted in these consolidated statements, on a retroactive basis, to reflect this l-for-10 reverse stock split for all periods presented. The par value per share and the authorized number of shares of common stock and convertible preferred stock were not adjusted because of the reverse stock split.

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Liquidity These condensed consolidated financial statements are prepared on a going concern basis that contemplates the realization of assets and extinguishment of liabilities in the normal course of business. The Company has incurred net operating losses and negative cash flows from operations since inception. As of September 30, 2018, and December 31, 2017, the Company has an accumulated deficit of $185,231 and $164,487 and, as of such dates, and through the date of this filing, does not have sufficient capital to fund its planned operations. Because of the Company’s recurring losses from operations and negative cash flows, the Company’s independent registered public accounting firm included an explanatory paragraph in its report on the Company’s consolidated financial statements as of, and for the year ended, December 31, 2017 that such factors raise substantial doubt about the Company’s ability to continue as a going concern. To continue its operations, the Company must achieve profitable operations and/or obtain additional financing. Until the Company generates revenue at a level to support its cost structure, the Company expects to continue to incur substantial operating losses and net cash outflows. The Company may never become profitable and even if it does attain profitable operations, it may not be able to sustain profitability or positive cash flows on a recurring basis. The Company will need to raise further capital in the future to service its debt or fund its operations until the time it can sustain positive cash flows. There can be no assurance that the Company will be successful in raising additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, it may be compelled to reduce the scope of its operations and planned capital expenditures or sell certain assets, including intellectual property assets. The accompanying condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business, and, as such, the condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or amounts and classification of liabilities that might be necessary should the Company be unable to continue in existence. Basis of Presentation The condensed consolidated balance sheet as of September 30, 2018, the condensed consolidated statements of operations and condensed consolidated statements of comprehensive loss for the three and nine months ended September 30, 2018 and 2017 and the condensed consolidated statements of cash flows for the nine months ended September 30, 2018 and 2017 and the condensed consolidated statement of stockholders’ equity for the nine months ended September 30, 2018 are unaudited. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and in the opinion of management, reflect all adjustments of a normal and recurring nature that are necessary for the fair presentation of the Company’s condensed consolidated financial statements included in this report. The condensed consolidated financial data disclosed in these notes to the condensed consolidated financial statements related to the three- and nine-month periods are also unaudited. The condensed consolidated results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018, or for any other future annual or interim period. The consolidated balance sheet as of December 31, 2017 included herein was derived from the audited consolidated financial statements as of that date. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in its Annual Report filed on Form 10-K for the year ended December 31, 2017, with the SEC on March 5, 2018. Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of Restoration Robotics, Inc. and its wholly owned subsidiaries, which are organized in the United States, United Kingdom, Spain, Hong Kong and South Korea. All significant intercompany accounts and transactions have been eliminated in consolidation. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions made in the accompanying condensed consolidated financial statements include, but are not limited to revenue recognition, the fair value of common stock, and the recoverability of the Company’s net deferred tax assets and related valuation allowance. The Company evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and circumstances dictate. Actual results could materially differ from those estimates. Reclassification Accrued compensation, which were previously included in other accrued liabilities in the prior year's condensed consolidated balance sheet have been reclassified to conform to the current period's presentation. The reclassification had no impact on the previously reported consolidated financial statements for the year ended December 31, 2017. Concentration of Customers For the three and nine months ended September 30, 2018, no customers accounted for more than 10% of the Company’s revenue. For the three months ended September 30, 2017, two customers accounted for 11% and 12% of the Company’s revenues and no customers accounted for more than 10% of the Company’s revenue for the nine months ended September 30, 2017. As of September 30, 2018, no customers accounted for more than 10% of the Company’s accounts receivable. As of December 31, 2017, two customers accounted for 10% and 11% of the Company’s accounts receivable. JOBS Act Accounting Election The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the JOBS Act). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued after the enactment of the JOBS Act until those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it is (i) no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, these condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates. Recently Issued Accounting Standards Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014‑09, Revenue from Contracts with Customers (Topic 606), as amended by ASU No. 2015-14, ASU No. 2016-08, ASU No. 2016-10, ASU No. 2016-12, and ASU No. 2016-20, collectively, ASU 2014-09. ASU 2014-09 establishes a principle for recognizing revenue upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration received in exchange for those goods or services and provides guidance on the recognition of costs related to obtaining and fulfilling customer contracts. For public entities, this standard is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. For all other entities, this standard is effective for annual reporting periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. ASU 2014‑09 may be adopted either retrospectively to each prior period presented (full retrospective method) or with the cumulative effect recognized as of the date of initial application (modified retrospective method). The Company expects to adopt this standard effective January 1, 2019 using the modified retrospective adoption method. The Company’s preliminary assessment of areas to be impacted by the new standard identified possible impact to the deferral of costs to obtain a contract, which are primarily commission expense directly incurred because of sales of products and related support, and the allocation of revenue between products and support and maintenance for certain arrangements, taking into account performance obligations that may be immaterial in the context of the contract under Topic 606. While the Company continues to assess the potential impact of the new standard, including the areas described above, it has not yet quantified the impact the new standard may have on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016‑02, Leases (Topic 842), or ASU 2016‑02, which requires lessees to record most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. Under ASU 2016‑02, a lessee would recognize a lease liability for the obligation to make lease payments and a right‑to‑use asset for the right to use the underlying asset for the lease term. For public entities, this standard is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period. For all other entities, this standard is effective for annual reporting periods beginning after December 15, 2019, and interim periods within annual periods beginning after December 15, 2020. Early adoption is permitted. The Company is currently evaluating the standard and its impact on the condensed consolidated financial statements. However, the Company does expect a material change in its consolidated assets and liabilities upon adoption of this standard.

Net Loss per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Net Loss per Share

3. NET LOSS PER SHARE

Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period, without consideration for common stock equivalents. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, convertible preferred stock, preferred stock warrants and stock options are common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The following outstanding shares of common stock equivalents were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:

	As of September 30,
	2018		2017
Options to purchase common stock		2,026,889		1,912,644
Convertible preferred stock		—		22,671,601
Warrants for preferred stock		—		385,126
Warrants for common stock		468,181		—
Total potential dilutive shares		2,495,070		24,969,371

Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. FAIR VALUE MEASUREMENTS

Cash and cash equivalents, restricted cash, accounts receivable, accounts payable, and accrued liabilities approximate fair market value because of the short-term nature of those instruments. The Company’s lease obligation, term loan and Convertible Notes have fair values that approximate their carrying value.

U.S. GAAP establishes a framework for measuring fair value and a fair value hierarchy based on the inputs used to measure fair value. This framework maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the observable inputs be used when available. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It applies to both items recognized and reported at fair value in the condensed consolidated financial statements and items disclosed at fair value in the notes to the condensed consolidated financial statements.

Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs reflect assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the transparency of inputs as follows:

Level 1 - Quoted prices are available in active markets for identical assets or liabilities as of the report date. A quoted price for an identical asset or liability in an active market provides the most reliable fair value measurement because it is directly observable to the market.

Level 2 - Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the report date. The nature of these securities includes investments for which quoted prices are available but traded less frequently and investments that are fair valued using other securities, the parameters of which can be directly observed.

Level 3 - Securities that have little to no pricing observability as of the report date. These securities are measured using management’s best estimate of fair value, where the inputs into the determination of fair value are not observable and require significant management judgment or estimation.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. However, the determination of what constitutes “observable” requires significant judgment by the Company. The categorization of a financial instrument within the hierarchy is based upon the pricing transparency of the instrument and does not necessarily correspond to the Company’s perceived risk of that instrument.

The following tables summarize the levels of fair value measurements of the Company’s cash equivalents:

	Fair Value Measurements as of September 30, 2018
	Quoted Prices in Active Markets using Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash Equivalents:
Money market account	$	21,940	$	—	$	—	$	21,940
Restricted cash:
Money market account		83		—		—		83
Total assets	$	22,023	$	—	$	—	$	22,023

	Fair Value Measurements as of December 31, 2017
	Quoted Prices in Active Markets using Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash Equivalents: (1)
Money market account	$	18,728	$	—	$	—	$	18,728
Restricted cash:
Money market account		100		—		—		100
Total assets	$	18,828	$	—	$	—	$	18,828

(1) The Company incorrectly overstated its cash equivalents by $4,817 in its annual report on Form 10-K for the year ended December 31, 2017. Cash equivalents were $18,728, while cash was $4,817. The error in disclosure had no impact on previously reported cash and cash equivalents in the consolidated balance sheet as of December 31, 2017 or consolidated statement of operations for the year ended December 31, 2017.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Balance Sheet Components

9 Months Ended

Sep. 30, 2018

Balance Sheet Components [Abstract]

Balance Sheet Components

5. BALANCE SHEET COMPONENTS

Inventory

Inventory consists of the following:

	September 30,		December 31,
	2018		2017
Finished goods	$	3,593	$	2,761
Work in process		38		—
Raw materials		815		—
Total inventory	$	4,446	$	2,761

Inventory as of September 30, 2018, includes work in process and raw materials related to the Company’s next generation ARTAS iX System which was launched and manufactured by the Company starting in the third quarter of 2018.

Property and Equipment, Net

Property and equipment, net consist of the following:

	September 30,			December 31,
	2018			2017
Equipment	$	3,625		$	2,929
Computer hardware and software		786			721
Leasehold improvements		874			869
Furniture and fixtures		453			270
Total property and equipment		5,738			4,789
Less: Accumulated depreciation and amortization		(4,182	)		(3,651	)
Total property and equipment, net	$	1,556		$	1,138

Depreciation and amortization expense were $268 and $539 for three and nine months ended September 30, 2018. Depreciation and amortization expense were $139 and $452 for the three and nine months ended September 30, 2017.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

6. COMMITMENTS AND CONTINGENCIES

Operating Leases

The Company has various operating leases including 23,000 square feet of office space in San Jose, California, which expires in April 2022.

Aggregate future minimum lease payments required under the Company’s operating leases as of September 30, 2018 are as follows:

Years Ending December 31,
2018 (remaining 3 months)	$	128
2019		518
2020		534
2021		550
2022		188
Thereafter	—
Total future minimum lease payments	$	1,918

Total rent expense was $163 and $401 for three and nine months ended September 30, 2018. Total rent expense was $103 and $310 for the three and nine months ended September 30, 2017.

Commitments

The Company has two master agreements and a component pricing agreement with Evolve Manufacturing Technologies, Inc. (Evolve) for the supply of the ARTAS^® System and consumable products. The terms of these master agreements are substantially similar. The master agreement for the sale of ARTAS^® Systems was effective beginning on April 1, 2016 and the master agreement for the sale of kits used with the ARTAS System was effective beginning on March 1, 2016. Both agreements are effective for an initial term of two years and will continue to automatically renew for additional twelve-month periods, subject to either party’s right to terminate the agreement upon 180 days advance notice during the initial term, if our quarterly forecasted demand falls below 75% of our historical forecasted demand for the same period in the previous year or upon 120 days’ advance notice after the initial term. Under the agreements, the Company has future purchase commitments up to $330 as of September 30, 2018.

In March 2018, the Company received U.S. FDA 510(k) clearance to expand the ARTAS^® System technology to include an implantation functionality, referred to as ARTAS^® iX. Based on manufacturing changes associated with the ARTAS^® iX System, the Company determined that certain components procured or expected to be procured by Evolve, will be in excess of expected demand or usage based on the advance notice the Company provided to Evolve under the term of the agreement mentioned above. Although the Company will be taking steps to minimize the adverse impact on the Company’s business, based on information available as of September 30, 2018, the Company’s management recorded a loss contingency accrual of $384 which is reported in “Cost of revenue” in the condensed consolidated statements of operations for the nine-months ended September 30, 2018 and included in “Other accrued liabilities” on the condensed consolidated balance sheets as of September 30, 2018. During the three-months ended September 30, 2018, the Company reduced the loss contingency estimate by $300 based on recent facts and circumstances available during the period.

Licensing Agreements

In July 2006, the Company entered into a license agreement with Rassman Licensing, LLC (Rassman) for non-exclusive, royalty bearing, non-transferable, perpetual, world-wide rights for use on approved fields relating to robotically controlled hair removal and implantation procedures. In consideration for this license, the Company paid Rassman a one-time payment of $1,000. The agreement terminates on May 9, 2020. In February 2012, the Company amended its license agreement with Rassman. In exchange for a one-time $400 payment to Rassman, the Company now has a fully paid royalty-free perpetual license to a patent subject to this license agreement.

In July 2006, the Company entered into a license agreement with HSC Development, LLC for exclusive non-transferable, royalty-free worldwide rights for use in approved fields relating to a computer-controlled system in which a device is carried on a mechanized arm for extraction or implantation of a follicular unit without manual manipulation. In consideration for this license, the Company paid HSC Development, LLC a one-time payment of $25 and issued 2,500 shares of the Company’s common stock. The agreement terminates on July 27, 2024.

Legal Proceedings

From time to time the Company is involved in litigation arising out of claims in the normal course of business. Based on the information presently available, management believes that there are no claims or actions pending or threatened against us, the ultimate resolution of which will have a material effect on our financial position, liquidity or results of operations, although the results of litigation are inherently uncertain.

Purported Shareholder Class Action

On May 23, 2018, a putative shareholder class action complaint was filed in Superior Court of the State of California, County of San Mateo (the “Superior Court”), captioned Wong v. Restoration Robotics, Inc., et al., No. 18CIV02609. On June 21, 2018 and June 28, 2018, two putative class action complaints were filed in the United States District Court for the Northern District of California, captioned Guerrini v. Restoration Robotics, Inc., et al., No. 5:18-cv-03712-EJD and Yzeiraj v. Restoration Robotics, Inc., et al., No. 5:18-cv-03883-BLF, respectively. On July 24, 2018, the U.S. Northern District Court related the Guerrini and Yzeiraj actions and reassigned the Yzeiraj action to Judge Edward J. Davila. The Wong and Guerrini complaints name the Company as defendants, and certain of its current and former executive officers and directors, certain of its venture capital investors and the underwriters in the Company’s IPO. The Yzeiraj complaint names the Company as defendants and certain of its current and former executive officers and directors. The Wong complaint asserts claims under Sections 11, 12(a)(2) and 15 of the Securities Act of 1933, or the Securities Act. The Guerrini and Yzeiraj complaints assert claims under Sections 11 and 15 of the Securities Act. The complaints all allege, among other things, that the Company’s Registration Statement filed with the SEC on September 1, 2017 and the Prospectus filed with the SEC on October 13, 2017 in connection with the Company’s IPO were inaccurate and misleading, contained untrue statements of material facts, omitted to state other facts necessary to make the statements made not misleading and omitted to state material facts required to be stated therein. The complaints seek unspecified monetary damages, other equitable relief and attorneys’ fees and costs.

On August 8, 2018, the Company, along with certain of its current and former executive officers and directors, filed a motion to dismiss the Wong complaint based on the forum selection clause designating the federal district courts as the exclusive forum for claims arising under the Securities Act contained in the Company’s Amended and Restated Certificate of Incorporation, and which asked the court in the alternative to stay the Wong action. Also, on August 8, 2018, the venture capital investor and underwriters’ defendants in the Wong action filed demurrers to the Wong complaint, and the Company, along with certain of its current and former executive officers and directors, joined in the venture capital investor defendants’ demurrer. A hearing on the Company’s motion to dismiss and the demurrers to the Wong complaint was held on October 24, 2018. The Company is unable to predict the date on which the Superior Court will issue any decision at this time.

On October 2, 2018, the U.S. Northern District Court granted a Motion for Consolidation of Related Actions, Appointment as Lead Plaintiff and Approval of Lead Counsel filed by Plaintiff Edgardo Guerrini, which consolidated the Guerrini and Yzeiraj actions under the caption In re Restoration Robotics, Inc. Securities Litigation, Case No. 5:18-cv-03712-EJD. The U.S. Northern District Court has set an initial hearing for January 24, 2019.

The Company believes that these lawsuits are without merit and management intends to vigorously defend against these claims.

Long-Term Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

7. LONG-TERM DEBT

Loan and Security Agreement

In May 2018, the Company entered into a Loan and Security Agreement (the Solar Agreement) with Solar Capital Ltd. (Solar) and certain other lenders thereunder (together with Solar, the Lenders), and Solar, as the Collateral Agent. The Solar Agreement consists of a four-year term loan for an aggregate principal amount of $20,000 (the Borrowings), for working capital, to fund the Company’s general business requirements and to repay indebtedness of the Company to Oxford Finance LLC (the Oxford Agreement). The Company used $10,085 of the loan proceeds to repay the outstanding principal of $8,667, a final payment fee of $1,300 plus accrued interest and prepayment fees of $118 under the Oxford Agreement. The Borrowings under the Solar Agreement bear interest through maturity at a rate equal to the U.S. Dollar LIBOR rate plus 7.95% per annum (the Interest Rate). The outstanding balance on the loan was $20,000 and accrued interest totaled $168 as of September 30, 2018. The Interest Rate was 10.1% at September 30, 2018.

Pursuant to the terms of the Solar Agreement, the Company shall make interest only payments until December 1, 2019 (the Interest Only Period). The Interest Only Period may be extended up to three additional months, if the Company achieves certain revenue and capital fundraising thresholds. Following cessation of the Interest Only Period, the Company shall make equal monthly payments on the outstanding principal balance of the Borrowings and any unpaid and accrued interest such that the Borrowings shall be fully repaid on May 1, 2022.

In addition, pursuant to the Solar Agreement, the Company issued the Lenders warrants (the Warrants) to purchase an aggregate of 161,725 shares of the Company’s common stock, $0.0001 par value per share, at an exercise price of $3.71 per share. The Warrants were immediately exercisable upon issuance, and excluding certain mergers or acquisitions, will expire on the ten-year anniversary of the date of issuance. The fair value of the Warrants issued was determined to be $404 using a Black-Scholes valuation model with the following assumptions: common stock price at issuance of $3.71 per share; exercise price of $3.71; risk-free interest rate of 2.97% based upon observed risk-free interest rates; expected volatility of 55.50% based on the Company’s implied volatility; expected term of ten years, which is the contractual life of the Warrants; and a dividend yield of 0%. The fair value of the Warrants was recorded as a debt discount within notes payable and an increase to additional paid-in capital on the Company’s balance sheet. The debt discount is being amortized as interest expense over the term of the Solar Agreement, using the effective interest method.

The third-party transaction costs (not paid directly to the lenders) related to the debt of $404 are accounted for as a debt discount and classified within notes payable on the Company’s balance sheet and amortized as interest expense over the term of the loan using the effective interest method. Unamortized debt discounts related to the Oxford Agreement and all fees paid directly to Solar and Oxford totaling $505 in connection with the debt financing in May 2018 were written off to “Other income (expense), net” in the consolidated statements of operations.

The obligations under the Solar Agreement are secured by a lien on substantially all the Company’s property, excluding intellectual property. The Solar Agreement contains certain affirmative covenants, negative covenants and events of default, including, covenants and restrictions that among other things, require the Company and its subsidiary to satisfy certain financial covenants including covenants requiring the Company to satisfy certain revenue and liquidity thresholds, and restricts the ability of the Company and its subsidiary’s ability to, incur liens, incur additional indebtedness, make loans and investments, engage in mergers and acquisitions, engage in asset sales or sale and leaseback transactions, and declare dividends or redeem or repurchase capital stock. A failure to comply with these covenants could permit the Lenders under the Solar Agreement to declare the Borrowings, together with accrued but unpaid interest and certain Prepayment Fees, to be immediately due and payable. On November 2, 2018, the Solar Agreement was amended to modify the compliance requirement for certain revenue and liquidity threshold. As part of this amendment, the Company paid a fee of $50 to the Lenders and cancelled 161,725 Warrants (originally issued in May 2018, as mentioned above) and issued 161,725 new warrants of the Company’s common stock, $0.0001 par value per share, at an exercise price of $1.76 per share. All other terms of the Warrants were unchanged. As of September 30, 2018, the Company was in compliance with all covenants under the Solar Agreement, as amended.

The Company is also required to make mandatory prepayments of the Borrowings, subject to specified exceptions, upon defaulting on any payments of principal or interest on the Borrowings, the occurrence of certain specified defaults of the covenants in the Solar Agreement, the occurrence of a material adverse change in the business, operations or conditions of the Company and specified other events (each, an Event of Default). Upon the occurrence and continuation of an Event of Default, the Borrowings shall accrue at the Interest Rate plus 4.0%.

If all or any of the Borrowings are prepaid or required to be prepaid under the Solar Agreement, then the Company shall pay, in addition to such prepayment, a prepayment premium (the Prepayment Premium) equal to (i) with respect to any such prepayment paid on or prior to May 1, 2019, 3.0% of the principal amount of the Borrowings being prepaid, (ii) with respect to any prepayments paid after May 1, 2019 but on or prior to May 1, 2020, 2.0% of the principal amount of the Borrowings being prepaid and (iii) with respect to any prepayments paid after May 1, 2020 but on or prior to May 1, 2021, 1.0% of the principal amount of the Borrowings being prepaid. Notwithstanding the foregoing, if the Lenders each participate in a refinancing of the Borrowings, then the Prepayment Premium shall be 0%.

The scheduled principal payments on the outstanding borrowings as of September 30, 2018 are as follows:

	As of
	September 30, 2018
2018 (remaining 3 months)	$	—
2019		667
2020		8,000
2021		8,000
2022		4,163
Total		20,830
Less debt discount		(1,454	)
Non-current portion	$	19,376

Common Stock Reserved For Issuance

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Common Stock Reserved For Issuance

8. COMMON STOCK RESERVED FOR ISSUANCE

The Company is required to reserve and keep available out of its authorized but unissued shares of common stock a number of shares sufficient to affect the conversion of all outstanding shares of convertible preferred stock, of which, there are none, plus options granted and available for grant under the incentive plans.

	September 30,		December 31,
	2018		2017
Outstanding common stock warrants		468,181		306,456
Outstanding and issued stock options		2,026,889		1,930,752
Shares reserved for future option grants ¹		2,800,358		2,162,037
Total common stock reserved for issuance		5,295,428		4,399,245

⁽¹⁾

The Company incorrectly understated its shares reserved for future option grants by 1,890,547 in its annual report on Form 10-K for the year ended December 31, 2017. The Company disclosed 271,490 shares reserved for future option grants at December 31, 2017, instead of 2,162,037 shares reserved for future option grants (as shown in the table above). The error in disclosure had no impact on previously reported consolidated financial statements as of and for the year ended December 31, 2017.

Stock Option Plan

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Plan

9. STOCK OPTION PLAN

2005 and 2015 Plans

The Company granted incentive stock options (ISOs) and non-statutory stock options (NSOs) pursuant to its 2005 Stock Option Plan (the 2005 Plan) until the Board of Directors approved the 2015 Stock Option Plan (the 2015 Plan), and all remaining shares available for future award under the 2005 Plan were transferred to the 2015 Plan and the 2005 Plan was terminated. The Company granted ISOs and NSOs pursuant to its 2015 Plan until the 2017 Equity Incentive Plan (the 2017 Plan) was approved by the Board of Directors and became effective on October 11, 2017. As a result of the 2017 Plan becoming effective, all remaining shares available for future award under the 2015 Plan were transferred to the 2017 Plan, the 2015 Plan was terminated, and no further grants will be made under the Company’s 2005 Plan and the 2015 Plan. Any outstanding stock awards granted under the 2005 Plan and the 2015 Plan will remain outstanding, subject to the terms of the Company’s 2005 Plan and 2015 Plan and the applicable stock award agreements, until such outstanding stock awards that are stock options are exercised or until they terminate or expire by their terms, or until such stock awards are fully settled, terminated or forfeited.

2017 Plan

The Company’s 2017 Plan provides for the grant of ISOs, NSOs, stock appreciation rights, restricted stock awards, restricted stock unit awards, and other forms of equity compensation to employees, directors and consultants. In addition, the Company’s 2017 Plan provides for the grant of performance cash awards to employees, directors and consultants.

The Company recognized stock-based compensation expense for its employees and non-employees in the accompanying consolidated statements of operations as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Cost of revenue	$	6	$	3	$	14	$	8
Sales and marketing		31		25		77		60
Research and development		11		18		39		69
General and administrative		119		72		289		212
Total stock-based compensation	$	167	$	118	$	419	$	349

Determination of Fair Value

The estimated grant-date fair value of all of the Company’s stock-based awards was calculated using the Black-Scholes-Merton option pricing model, based on the following assumptions:

	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2018	2017 *		2018	2017
Expected term (years)	6.0		—	5.37 - 6.10	4.95 - 7.50
Risk-free interest rate	2.82%		—	2.40 - 2.82%	1.77 - 2.13%
Expected volatility	53.87%		—	53.72 - 55.49%	51.62 - 53.58%
Dividend yield	0%		—	0%	0%

*No stock options were issued during the three months ended September 30, 2017

The following table summarizes stock option activity under the Company’s stock option plan:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Number of			Exercise Price		Contractual		Intrinsic
	Shares			per Share		Term		Value
Outstanding — December 31, 2017		1,930,752		$	1.90		7.9	$	5,322
Options granted		539,207			3.77
Options exercised		(235,730	)		1.66
Options cancelled		(207,340	)		2.02
Outstanding — September 30, 2018		2,026,889		$	2.39		8.0	$	1,804
Vested and expected to vest — September 30, 2018		1,906,322		$	2.36		7.9	$	1,724
Exercisable — September 30, 2018		945,639		$	1.83		7.1	$	1,053

The weighted-average grant date fair value of options granted was $2.01 per share for nine months ended September 30, 2018.

The total intrinsic value of options exercised was $92.0 and $413.0 for the three and nine months September 30, 2018, and $0 for three and nine months ended September 30, 2017, respectively.

Unamortized stock-based compensation was $1,300 as of September 30, 2018, which is expected to be recognized over a weighted-average period of approximately 3.50 years.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES The Company generated a loss for the three and nine months ended September 30, 2018 and incurred $8 and $32 of tax expense for the three and nine months ended September 30, 2018, respectively. The Company’s effective tax rate is (0.12)% and (0.18)% for income tax for the three and nine months ended September 30, 2018 and the Company expects that its effective tax rate for the full year 2018 will be (0.42)%. Based on available evidence, including cumulative losses since inception and expected future losses, the Company has determined that it is more likely than not that the Company’s U.S. federal, U.S. state and Korea deferred tax assets will not be realized and therefore a valuation allowance has been provided on these net deferred tax assets. The Company has substantial net operating loss carry forwards available to offset future taxable income for U.S. federal and state income tax purposes. The Company’s ability to utilize its net operating losses may be limited due to changes in its ownership as defined by Section 382 of the Internal Revenue Code (the Code). Under the provisions of Sections 382 and 383 of the Code, a change of control, as defined in the Code, may impose an annual limitation on the amount of the Company’s net operating loss and tax credit carryforwards, and other tax attributes that can be used to reduce future tax liabilities. The Company files tax returns for U.S. federal and state tax returns along with tax returns in the United Kingdom, Hong Kong, Spain and South Korea. The Company is not currently subject to any income tax examinations. Since the Company’s inception, the Company had incurred losses from its U.S. operations, which generally allows all tax years to remain open. Beginning in first quarter of 2018, the Company is subject to new provisions of the tax law, including provisions related to Global Low Taxed Intangible Income (GILTI), Foreign Derived Intangible Income deductions (FDII), and other changes. However, due to the Company’s losses and full valuation allowance in the U.S., these were determined to have no material impact to the Estimated Annual Effective Tax Rate due to the full Valuation Allowance in the U.S. Uncertain Tax Positions Effective January 1, 2009, the Company adopted ASC 740-10, which requires that the Company recognize the financial statement effects of a tax position when it becomes more likely than not, based upon the technical merits, that the position will be sustained upon examination. The gross amount of unrecognized tax benefits as of September 30, 2018 is approximately $1,420 and related to the reserve on R&D credits, none of which will affect the effective tax rate if recognized due to the valuation allowance. The Company does not expect any material changes in the next 12 months in unrecognized tax benefits. The Company recognizes interest and/or penalties related to uncertain tax positions. To the extent accrued interest and penalties do not ultimately become payable, amounts accrued will be reduced and reflected in the period that such determination is made. The interest and penalties are recognized as other expense and not tax expense. The Company currently has no interest and penalties related to uncertain tax positions.

Segment and Geographic Information

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment and Geographic Information

11. SEGMENT AND GEOGRAPHIC INFORMATION

The Company has determined that it operates in a single operating segment and has one reportable segment, as its Chief Executive Officer, reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance. The Company does not assess the performance of individual product line on measures of profit or loss, or asset-based metrics. Therefore, the information below is presented only for revenues by geography.

The following table reflects revenue by geographic area by customer location:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
United States	$	3,856	$	1,429	$	8,712	$	6,242
Europe and Middle East		362		1,205		2,323		4,333
Asia Pacific		553		874		3,213		3,192
Rest of World		47		669		1,050		1,674
Total revenue	$	4,818	$	4,177	$	15,298	$	15,441

As of September 30, 2018, and December 31, 2017, all long-lived assets were located within the United States.

Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	12. SUBSEQUENT EVENT The Company’s Board of Directors appointed Keith Sullivan, a current Board member of the Company, as interim Chief Commercial Officer, effective November 1, 2018, and for a period up to one year. Under the terms of the arrangement, Mr. Sullivan was granted 360,000 restricted stock awards, which shall vest in quarterly installments equal to 25% of the shares starting with the first vest date on January 15, 2019 so long as Mr. Sullivan is providing services.

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Liquidity	Liquidity These condensed consolidated financial statements are prepared on a going concern basis that contemplates the realization of assets and extinguishment of liabilities in the normal course of business. The Company has incurred net operating losses and negative cash flows from operations since inception. As of September 30, 2018, and December 31, 2017, the Company has an accumulated deficit of $185,231 and $164,487 and, as of such dates, and through the date of this filing, does not have sufficient capital to fund its planned operations. Because of the Company’s recurring losses from operations and negative cash flows, the Company’s independent registered public accounting firm included an explanatory paragraph in its report on the Company’s consolidated financial statements as of, and for the year ended, December 31, 2017 that such factors raise substantial doubt about the Company’s ability to continue as a going concern. To continue its operations, the Company must achieve profitable operations and/or obtain additional financing. Until the Company generates revenue at a level to support its cost structure, the Company expects to continue to incur substantial operating losses and net cash outflows. The Company may never become profitable and even if it does attain profitable operations, it may not be able to sustain profitability or positive cash flows on a recurring basis. The Company will need to raise further capital in the future to service its debt or fund its operations until the time it can sustain positive cash flows. There can be no assurance that the Company will be successful in raising additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, it may be compelled to reduce the scope of its operations and planned capital expenditures or sell certain assets, including intellectual property assets. The accompanying condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business, and, as such, the condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or amounts and classification of liabilities that might be necessary should the Company be unable to continue in existence.
Basis of Presentation	Basis of Presentation The condensed consolidated balance sheet as of September 30, 2018, the condensed consolidated statements of operations and condensed consolidated statements of comprehensive loss for the three and nine months ended September 30, 2018 and 2017 and the condensed consolidated statements of cash flows for the nine months ended September 30, 2018 and 2017 and the condensed consolidated statement of stockholders’ equity for the nine months ended September 30, 2018 are unaudited. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and in the opinion of management, reflect all adjustments of a normal and recurring nature that are necessary for the fair presentation of the Company’s condensed consolidated financial statements included in this report. The condensed consolidated financial data disclosed in these notes to the condensed consolidated financial statements related to the three- and nine-month periods are also unaudited. The condensed consolidated results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018, or for any other future annual or interim period. The consolidated balance sheet as of December 31, 2017 included herein was derived from the audited consolidated financial statements as of that date. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in its Annual Report filed on Form 10-K for the year ended December 31, 2017, with the SEC on March 5, 2018.
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of Restoration Robotics, Inc. and its wholly owned subsidiaries, which are organized in the United States, United Kingdom, Spain, Hong Kong and South Korea. All significant intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions made in the accompanying condensed consolidated financial statements include, but are not limited to revenue recognition, the fair value of common stock, and the recoverability of the Company’s net deferred tax assets and related valuation allowance. The Company evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and circumstances dictate. Actual results could materially differ from those estimates.
Reclassification	Reclassification Accrued compensation, which were previously included in other accrued liabilities in the prior year's condensed consolidated balance sheet have been reclassified to conform to the current period's presentation. The reclassification had no impact on the previously reported consolidated financial statements for the year ended December 31, 2017.
Concentration of Customers	Concentration of Customers For the three and nine months ended September 30, 2018, no customers accounted for more than 10% of the Company’s revenue. For the three months ended September 30, 2017, two customers accounted for 11% and 12% of the Company’s revenues and no customers accounted for more than 10% of the Company’s revenue for the nine months ended September 30, 2017. As of September 30, 2018, no customers accounted for more than 10% of the Company’s accounts receivable. As of December 31, 2017, two customers accounted for 10% and 11% of the Company’s accounts receivable.
Jobs Act Accounting Election	JOBS Act Accounting Election The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the JOBS Act). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued after the enactment of the JOBS Act until those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it is (i) no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, these condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014‑09, Revenue from Contracts with Customers (Topic 606), as amended by ASU No. 2015-14, ASU No. 2016-08, ASU No. 2016-10, ASU No. 2016-12, and ASU No. 2016-20, collectively, ASU 2014-09. ASU 2014-09 establishes a principle for recognizing revenue upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration received in exchange for those goods or services and provides guidance on the recognition of costs related to obtaining and fulfilling customer contracts. For public entities, this standard is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. For all other entities, this standard is effective for annual reporting periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. ASU 2014‑09 may be adopted either retrospectively to each prior period presented (full retrospective method) or with the cumulative effect recognized as of the date of initial application (modified retrospective method). The Company expects to adopt this standard effective January 1, 2019 using the modified retrospective adoption method. The Company’s preliminary assessment of areas to be impacted by the new standard identified possible impact to the deferral of costs to obtain a contract, which are primarily commission expense directly incurred because of sales of products and related support, and the allocation of revenue between products and support and maintenance for certain arrangements, taking into account performance obligations that may be immaterial in the context of the contract under Topic 606. While the Company continues to assess the potential impact of the new standard, including the areas described above, it has not yet quantified the impact the new standard may have on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016‑02, Leases (Topic 842), or ASU 2016‑02, which requires lessees to record most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. Under ASU 2016‑02, a lessee would recognize a lease liability for the obligation to make lease payments and a right‑to‑use asset for the right to use the underlying asset for the lease term. For public entities, this standard is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period. For all other entities, this standard is effective for annual reporting periods beginning after December 15, 2019, and interim periods within annual periods beginning after December 15, 2020. Early adoption is permitted. The Company is currently evaluating the standard and its impact on the condensed consolidated financial statements. However, the Company does expect a material change in its consolidated assets and liabilities upon adoption of this standard.

Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders

	As of September 30,
	2018		2017
Options to purchase common stock		2,026,889		1,912,644
Convertible preferred stock		—		22,671,601
Warrants for preferred stock		—		385,126
Warrants for common stock		468,181		—
Total potential dilutive shares		2,495,070		24,969,371

Fair Value Measurements - (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule for Levels of Fair Value Measurements of Cash Equivalents

The following tables summarize the levels of fair value measurements of the Company’s cash equivalents:

	Fair Value Measurements as of September 30, 2018
	Quoted Prices in Active Markets using Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash Equivalents:
Money market account	$	21,940	$	—	$	—	$	21,940
Restricted cash:
Money market account		83		—		—		83
Total assets	$	22,023	$	—	$	—	$	22,023

	Fair Value Measurements as of December 31, 2017
	Quoted Prices in Active Markets using Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash Equivalents: (1)
Money market account	$	18,728	$	—	$	—	$	18,728
Restricted cash:
Money market account		100		—		—		100
Total assets	$	18,828	$	—	$	—	$	18,828

(1) The Company incorrectly overstated its cash equivalents by $4,817 in its annual report on Form 10-K for the year ended December 31, 2017. Cash equivalents were $18,728, while cash was $4,817. The error in disclosure had no impact on previously reported cash and cash equivalents in the consolidated balance sheet as of December 31, 2017 or consolidated statement of operations for the year ended December 31, 2017.

Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2018

Balance Sheet Components [Abstract]

Schedule of Inventory

Inventory consists of the following:

	September 30,		December 31,
	2018		2017
Finished goods	$	3,593	$	2,761
Work in process		38		—
Raw materials		815		—
Total inventory	$	4,446	$	2,761

Schedule of Property and Equipment, Net

Property and equipment, net consist of the following:

	September 30,			December 31,
	2018			2017
Equipment	$	3,625		$	2,929
Computer hardware and software		786			721
Leasehold improvements		874			869
Furniture and fixtures		453			270
Total property and equipment		5,738			4,789
Less: Accumulated depreciation and amortization		(4,182	)		(3,651	)
Total property and equipment, net	$	1,556		$	1,138

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Summary of Aggregate Future Minimum Lease Payments under Operating Leases

Aggregate future minimum lease payments required under the Company’s operating leases as of September 30, 2018 are as follows:

Years Ending December 31,
2018 (remaining 3 months)	$	128
2019		518
2020		534
2021		550
2022		188
Thereafter	—
Total future minimum lease payments	$	1,918

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule Principal Payments on Outstanding Borrowings

The scheduled principal payments on the outstanding borrowings as of September 30, 2018 are as follows:

	As of
	September 30, 2018
2018 (remaining 3 months)	$	—
2019		667
2020		8,000
2021		8,000
2022		4,163
Total		20,830
Less debt discount		(1,454	)
Non-current portion	$	19,376

Common Stock Reserved For Issuance (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of Common Stock Available for Grant Under Employee Stock Incentive Plans and Reserves for Warrants

	September 30,		December 31,
	2018		2017
Outstanding common stock warrants		468,181		306,456
Outstanding and issued stock options		2,026,889		1,930,752
Shares reserved for future option grants ¹		2,800,358		2,162,037
Total common stock reserved for issuance		5,295,428		4,399,245

⁽¹⁾

Stock Option Plan (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Recognized Stock-based Compensation Expense for Employees and Non-employees

The Company recognized stock-based compensation expense for its employees and non-employees in the accompanying consolidated statements of operations as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Cost of revenue	$	6	$	3	$	14	$	8
Sales and marketing		31		25		77		60
Research and development		11		18		39		69
General and administrative		119		72		289		212
Total stock-based compensation	$	167	$	118	$	419	$	349

Fair Value of Stock Options Granted to Employees

The estimated grant-date fair value of all of the Company’s stock-based awards was calculated using the Black-Scholes-Merton option pricing model, based on the following assumptions:

	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2018	2017 *		2018	2017
Expected term (years)	6.0		—	5.37 - 6.10	4.95 - 7.50
Risk-free interest rate	2.82%		—	2.40 - 2.82%	1.77 - 2.13%
Expected volatility	53.87%		—	53.72 - 55.49%	51.62 - 53.58%
Dividend yield	0%		—	0%	0%

*No stock options were issued during the three months ended September 30, 2017

Summary of Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plan:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Number of			Exercise Price		Contractual		Intrinsic
	Shares			per Share		Term		Value
Outstanding — December 31, 2017		1,930,752		$	1.90		7.9	$	5,322
Options granted		539,207			3.77
Options exercised		(235,730	)		1.66
Options cancelled		(207,340	)		2.02
Outstanding — September 30, 2018		2,026,889		$	2.39		8.0	$	1,804
Vested and expected to vest — September 30, 2018		1,906,322		$	2.36		7.9	$	1,724
Exercisable — September 30, 2018		945,639		$	1.83		7.1	$	1,053

Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Revenue by Geographic Area

The following table reflects revenue by geographic area by customer location:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
United States	$	3,856	$	1,429	$	8,712	$	6,242
Europe and Middle East		362		1,205		2,323		4,333
Asia Pacific		553		874		3,213		3,192
Rest of World		47		669		1,050		1,674
Total revenue	$	4,818	$	4,177	$	15,298	$	15,441

Nature of Operations - Additional Information (Details) $ / shares in Units, $ in Thousands				9 Months Ended
	Aug. 16, 2018 USD ($) $ / shares shares	Oct. 16, 2017 USD ($) $ / shares shares	Sep. 15, 2017	Sep. 30, 2018 USD ($)
Nature of Operations [Line Items]
Proceeds from follow-on offering, net \| $				$ 15,615
Reverse stock split of common stock, description			1-for-10 reverse stock split
Reverse stock split of common stock, ratio			0.1
IPO
Nature of Operations [Line Items]
Number of common stock shares issued \| shares		3,897,910
Shares issued price per share \| $ / shares		$ 7.00
Aggregate proceeds from initial public offering, after deducting underwriter discounts and commission \| $		$ 22,114
Offering costs \| $		$ 5,171
Outstanding shares of convertible preferred stock converted into common stock \| shares		22,671,601
IPO \| Subordinated Convertible Notes
Nature of Operations [Line Items]
Outstanding convertible notes converted into common stock \| shares		718,184
Over-Allotment Option
Nature of Operations [Line Items]
Number of common stock shares issued \| shares	1,500,000	322,910
Follow-on Public Offering
Nature of Operations [Line Items]
Number of common stock shares issued \| shares	10,000,000
Shares issued price per share \| $ / shares	$ 1.50
Offering costs \| $	$ 1,600
Proceeds from follow-on offering, net \| $	$ 15,600

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) Customer	Sep. 30, 2017 Customer	Sep. 30, 2018 USD ($) Customer	Sep. 30, 2017 Customer	Dec. 31, 2017 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit \| $	$ (185,231)		$ (185,231)		$ (164,487)
Customer Concentration Risk \| Revenue
Summary Of Significant Accounting Policies [Line Items]
Number of major customers	0		0	0
Customer Concentration Risk \| Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of major customers		2	0		2
Customer Concentration Risk \| Customer One \| Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		11.00%
Customer Concentration Risk \| Customer One \| Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage					10.00%
Customer Concentration Risk \| Customer Two \| Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		12.00%
Customer Concentration Risk \| Customer Two \| Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage					11.00%

Net Loss Per Share - Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders (Details) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potential dilutive shares	2,495,070	24,969,371
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potential dilutive shares	2,026,889	1,912,644
Warrants for Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potential dilutive shares		385,126
Warrants for Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potential dilutive shares	468,181
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potential dilutive shares		22,671,601

Fair Value Measurements - Schedule for Levels of Fair Value Measurements of Cash Equivalents - (Details) - USD ($)
$ in Thousands

Sep. 30, 2018

Dec. 31, 2017

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Total assets

$ 22,023

$ 18,828

Quoted Prices in Active Markets using Identical Assets (Level 1)

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Total assets

22,023

18,828

Money Market Account

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Cash Equivalents

21,940

18,728

^[1]

Restricted cash

100

Money Market Account | Quoted Prices in Active Markets using Identical Assets (Level 1)

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Cash Equivalents

21,940

18,728

^[1]

Restricted cash

$ 83

$ 100

[1]

The Company incorrectly overstated its cash equivalents by $4,817 in its annual report on Form 10-K for the year ended December 31, 2017. Cash equivalents were $18,728, while cash was $4,817. The error in disclosure had no impact on previously reported cash and cash equivalents in the consolidated balance sheet as of December 31, 2017 or consolidated statement of operations for the year ended December 31, 2017.

Fair Value Measurements - Schedule for Levels of Fair Value Measurements of Cash Equivalents - (Parenthetical) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	$ 18,728
Cash	4,817
Overstated
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	$ 4,817

Balance Sheet Components - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 3,593	$ 2,761
Work in process	38
Raw materials	815
Total inventory	$ 4,446	$ 2,761

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Equipment	$ 3,625	$ 2,929
Computer hardware and software	786	721
Leasehold improvements	874	869
Furniture and fixtures	453	270
Total property and equipment	5,738	4,789
Less: Accumulated depreciation and amortization	(4,182)	(3,651)
Total property and equipment, net	$ 1,556	$ 1,138

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Depreciation and amortization	$ 268	$ 139	$ 539	$ 452

Commitments and Contingencies - Additional Information (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 29, 2012 USD ($)	Jul. 31, 2006 USD ($) shares	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) ft² Agreement Complaint	Sep. 30, 2017 USD ($)
Commitment And Contingencies [Line Items]
Rent expense			$ 163	$ 103	$ 401	$ 310
Loss contingency accrual					$ 384
Decrease in loss contingency accrual			300
Number of complaints filed \| Complaint					2
Rassman Licensing, LLC
Commitment And Contingencies [Line Items]
License agreement termination date		May 09, 2020
Rassman Licensing, LLC \| License Agreement
Commitment And Contingencies [Line Items]
One time payment of royalty related to license	$ 400	$ 1,000
HSC Development, LLC
Commitment And Contingencies [Line Items]
License agreement termination date		Jul. 27, 2024
HSC Development, LLC \| License Agreement
Commitment And Contingencies [Line Items]
One time payment of royalty related to license		$ 25
Number of common stock shares issued \| shares		2,500
Evolve Manufacturing Technologies, Inc. \| ARTAS Systems
Commitment And Contingencies [Line Items]
Number of master agreements \| Agreement					2
Master agreement for purchase of robotic device, effective date					Apr. 01, 2016
Master agreement for purchase of kits used with robotic device, effective date					Mar. 01, 2016
Initial term of master agreements					2 years
Master agreements, renewal term					12 months
Master agreements, term description					Both agreements are effective for an initial term of two years and will continue to automatically renew for additional twelve-month periods, subject to either party’s right to terminate the agreement upon 180 days advance notice during the initial term, if our quarterly forecasted demand falls below 75% of our historical forecasted demand for the same period in the previous year or upon 120 days’ advance notice after the initial term.
Future purchase commitments			$ 330		$ 330
San Jose, California
Commitment And Contingencies [Line Items]
Operating lease office space area \| ft²			23,000		23,000
Operating lease expiration date					2022-04

Commitments and Contingencies - Summary of Aggregate Future Minimum Lease Payments under Operating Leases (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018 (remaining 3 months)	$ 128
2019	518
2020	534
2021	550
2022	188
Total future minimum lease payments	$ 1,918

Long-Term Debt - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
	Nov. 02, 2018	May 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Common stock, par value			$ 0.0001	$ 0.0001
Loan and Security Agreement
Debt Instrument [Line Items]
Debt conversion, warrants issued			161,725
Common stock, par value			$ 0.0001
Exercise price of warrants			$ 3.71
Debt instrument, term			10 years
Fair value of warrants issued			$ 404
Debt instrument transaction cost related amount			$ 404
Debt instrument, default interest percentage			4.00%
Percentage of prepayment premium			0.00%
Loan and Security Agreement \| On Or Prior To May 1, 2019
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid			3.00%
Loan and Security Agreement \| After May 1, 2019 But On Or Prior To May 1, 2020
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid			2.00%
Loan and Security Agreement \| After May 1, 2020 But On Or Prior To May 1, 2021
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid			1.00%
Loan and Security Agreement \| Subsequent Event
Debt Instrument [Line Items]
Debt conversion, warrants issued	161,725
Common stock, par value	$ 0.0001
Exercise price of warrants	$ 1.76
Fee paid to lenders	$ 50
Cancellation of warrants	161,725
Loan and Security Agreement \| Other Income (Expense), Net
Debt Instrument [Line Items]
Debt instrument, unamortized debt discount and fee amount			$ 505
Loan and Security Agreement \| Measurement Input, Share Price
Debt Instrument [Line Items]
Warrants and Rights Outstanding, Measurement Input			3.71
Loan and Security Agreement \| Measurement Input, Exercise Price
Debt Instrument [Line Items]
Warrants and Rights Outstanding, Measurement Input			3.71
Loan and Security Agreement \| Measurement Input, Risk Free Interest Rate
Debt Instrument [Line Items]
Warrants and Rights Outstanding, Measurement Input			0.0297
Loan and Security Agreement \| Measurement Input, Price Volatility
Debt Instrument [Line Items]
Warrants and Rights Outstanding, Measurement Input			0.5550
Loan and Security Agreement \| Measurement Input, Expected Term
Debt Instrument [Line Items]
Debt instrument, term			10 years
Loan and Security Agreement \| Measurement Input, Expected Dividend Rate
Debt Instrument [Line Items]
Warrants and Rights Outstanding, Measurement Input			0.00
Loan and Security Agreement
Debt Instrument [Line Items]
Debt instrument, borrowed amount		$ 20,000
Debt instrument, term		4 years
Proceeds from loan used to repay debt		$ 10,085
Debt instrument, final payment amount upon maturity		1,300
Debt instrument, outstanding balance repaid		8,667
Debt instrument accrued interest and prepayment fees		$ 118
Debt instrument, outstanding balance			$ 20,000
Debt instrument, accrued interest			$ 168
Debt instrument, interest rate			10.10%
Debt instrument, interest only period			Dec. 01, 2019
Debt Instrument, full repayment date			May 01, 2022
Loan and Security Agreement \| Maximum
Debt Instrument [Line Items]
Debt instrument, additional interest only period			3 months
Loan and Security Agreement \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		7.95%

Long-Term Debt - Schedule Principal Payments on Outstanding Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 667
2020	8,000
2021	8,000
2022	4,163
Total	20,830
Less debt discount	(1,454)
Non-current portion	$ 19,376	$ 5,271

Schedule of Common Stock Available for Grant Under Employee Stock Incentive Plans and Reserves for Warrants (Details) - shares

Sep. 30, 2018

Dec. 31, 2017

Class Of Stock [Line Items]

Outstanding and issued stock options

2,026,889

1,930,752

Shares reserved for future option grants

^[1]

2,800,358

2,162,037

Total common stock reserved for issuance

5,295,428

4,399,245

Common Stock

Class Of Stock [Line Items]

Outstanding common stock warrants

468,181

306,456

[1]

Schedule of Common Stock Available for Grant Under Employee Stock Incentive Plans and Reserves for Warrants (Parenthetical) (Details) - shares

Sep. 30, 2018

Dec. 31, 2017

Class Of Stock [Line Items]

Shares reserved for future option grants

^[1]

2,800,358

2,162,037

Scenario, Previously Reported

Class Of Stock [Line Items]

Shares reserved for future option grants

271,490

Error Correction of Shares Reserved for Future Option Grants Understated

Class Of Stock [Line Items]

Shares reserved for future option grants

1,890,547

[1]

Stock Option Plan - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 11, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value of options granted				$ 2.01
Total intrinsic value of options exercised		$ 92,000	$ 0	$ 413,000	$ 0
Unamortized stock-based compensation		$ 1,300,000		$ 1,300,000
Unamortized stock-based compensation, weighted-average period				3 years 6 months
2017 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Effective date of plan	Oct. 11, 2017

Stock Option Plan - Summary of Recognized Stock-based Compensation Expense for Employees and Non-employees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation			$ 419	$ 349
Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 167	$ 118	419	349
Cost of Revenue \| Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	6	3	14	8
Sales and Marketing \| Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	31	25	77	60
Research and Development \| Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	11	18	39	69
General and Administrative \| Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 119	$ 72	$ 289	$ 212

Stock Option Plan - Estimated Grant-Date Fair Value of Stock-Based Awards Calculated Using Black-Scholes-Merton Option Pricing Model (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (years)	6 years
Risk-free interest rate	2.82%
Risk-free interest rate, minimum		2.40%	1.77%
Risk-free interest rate, maximum		2.82%	2.13%
Expected volatility	53.87%
Expected volatility, minimum		53.72%	51.62%
Expected volatility, maximum		55.49%	53.58%
Dividend yield	0.00%	0.00%	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (years)		5 years 4 months 13 days	4 years 11 months 12 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (years)		6 years 1 month 6 days	7 years 6 months

Stock Option Plan - Estimated Grant-Date Fair Value of Stock-Based Awards Calculated Using Black-Scholes-Merton Option Pricing Model (Parenthetical) (Details)	3 Months Ended
	Sep. 30, 2017 shares
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options issued	0

Stock Option Plan - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Number of Shares, Outstanding, Beginning Balance	1,930,752
Number of Shares, Options granted	539,207
Number of Shares, Options exercised	(235,730)
Number of Shares, Options cancelled	(207,340)
Number of Shares, Outstanding, Ending Balance	2,026,889	1,930,752
Number of Shares, Vested and expected to vest	1,906,322
Number of Shares, Exercisable	945,639
Weighted-Average Exercise Price Per Share, Outstanding, Beginning Balance	$ 1.90
Weighted-Average Exercise Price Per Share, Options granted	3.77
Weighted-Average Exercise Price Per Share, Options exercised	1.66
Weighted-Average Exercise Price Per Share, Options cancelled	2.02
Weighted-Average Exercise Price Per Share, Outstanding, Ending Balance	2.39	$ 1.90
Weighted-Average Exercise Price Per Share, Vested and expected to vest	2.36
Weighted-Average Exercise Price Per Share, Exercisable	$ 1.83
Weighted-Average Remaining Contractual Term, Outstanding	8 years	7 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest	7 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable	7 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding	$ 1,804	$ 5,322
Aggregate Intrinsic Value, Vested and expected to vest	1,724
Aggregate Intrinsic Value, Exercisable	$ 1,053

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 8,000	$ 25,000	$ 32,000	$ 50,000
Effective income tax rate	(0.12%)		(0.18%)
Effective income tax rate, expected rate for fiscal year			(0.42%)
Unrecognized tax benefits	$ 1,420,000		$ 1,420,000
Interest and penalties related to uncertain tax positions	$ 0		$ 0

Segment and Geographic Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2018 Segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 4,818	$ 4,177	$ 15,298	$ 15,441
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	3,856	1,429	8,712	6,242
Europe and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	362	1,205	2,323	4,333
Asia Pacific
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	553	874	3,213	3,192
Rest of World
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 47	$ 669	$ 1,050	$ 1,674

Subsequent Event - Additional Information (Details) - Keith Sullivan - shares		9 Months Ended
	Nov. 01, 2018	Sep. 30, 2018
Restricted Stock Awards
Subsequent Event [Line Items]
Vesting rights description		Under the terms of the arrangement, Mr. Sullivan was granted 360,000 restricted stock awards, which shall vest in quarterly installments equal to 25% of the shares starting with the first vest date on January 15, 2019
Subsequent Event \| Maximum
Subsequent Event [Line Items]
Term of office	1 year
Subsequent Event \| Restricted Stock Awards
Subsequent Event [Line Items]
Number of stock awards granted	360,000
Vesting percentage	25.00%
First vest date	Jan. 15, 2019