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Net Loss Per Share of Common Stock - Antidilutive Securities Excluding from Computation of Earnings Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents excluded from the computation of diluted net loss per share | 2,711,667 | 3,015,021 | 2,711,667 | 3,015,021
Shares subject to repurchase |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents excluded from the computation of diluted net loss per share | 78,757 | 25,150 | 78,757 | 25,150
Redeemable convertible preferred stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents excluded from the computation of diluted net loss per share | 12,066,654 | 12,066,654 | 12,066,654 | 12,066,654
Redeemable convertible preferred stock warrants |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents excluded from the computation of diluted net loss per share | 160,657 | 160,657 | 160,657 | 160,657
Common stock warrants |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents excluded from the computation of diluted net loss per share | 124,326 | 124,326 | 124,326 | 124,326

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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