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Common Stock - Shares of Stock Issued and Reserved (Details) - shares	Sep. 30, 2018	Dec. 31, 2017
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.

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Number of common stock equivalent shares related to potential conversion of temporary equity shares.

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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.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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.

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Number of options outstanding, including both vested and non-vested options.

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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.

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