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Common Stock - Shares of Stock Issued and Reserved (Details) - shares | Sep. 30, 2018 | Dec. 31, 2017
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Class of Stock [Line Items] |  |
Common stock outstanding (in shares) | 3,912,907 | 3,603,140
Redeemable convertible preferred stock outstanding (in shares) | 11,871,578 | 11,871,578
Stock options outstanding (in shares) | 2,711,667 | 3,001,929
Stock options outstanding, common stock equivalents (in shares) | 2,711,667 | 3,001,929
Stock options available for grant (in shares) | 10,149 | 29,654
Warrants to purchase shares of stock (in shares) | 280,876 | 280,876
Total issued and reserved for issuance (in shares) | 18,787,177 | 18,787,177
Total issued and reserved for issuance, common stock equivalents (in shares) | 18,986,360 | 18,986,360
Series 1 Common Stock |  |
Class of Stock [Line Items] |  |
Common stock outstanding (in shares) | 3,422,722 | 3,112,955
Series 2 Common Stock |  |
Class of Stock [Line Items] |  |
Common stock outstanding (in shares) | 490,185 | 490,185
Warrants to purchase shares of stock (in shares) | 124,326 | 124,326
Warrants to purchase shares of stock, common stock equivalents (in shares) | 124,326 | 124,326
Redeemable Convertible Preferred Stock |  |
Class of Stock [Line Items] |  |
Redeemable convertible preferred stock outstanding (in shares) | 11,871,578 | 11,871,578
Redeemable convertible preferred stock outstanding, common stock equivalents (in shares) | 12,066,654 | 12,066,654
Warrants to purchase shares of stock (in shares) | 156,550 | 156,550
Warrants to purchase shares of stock, common stock equivalents (in shares) | 160,657 | 160,657

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- Definition Number of common stock equivalent shares related to potential conversion of warrants into common stock, preferred stock, or temporary equity. + References No definition available. + Details
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- Definition Number of common stock equivalent shares related to potential exercise of stock options outstanding. + References No definition available. + Details
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- Definition Equity And Temporary Equity, Common Stock Equivalent Shares Issued And Reserved For Future Issuance + References No definition available. + Details
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- Definition Equity And Temporary Equity, Shares Issued And Reserved For Future Issuance + References No definition available. + Details
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- Definition Number of common stock equivalent shares related to potential conversion of temporary equity shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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