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Net Loss Per Share Attributable to Common Stockholders - Summary of Potentially Dilutive Common Shares were Excluded from Calculation of Diluted Net Loss Per Share (Details) - shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share | 2,517,518 | 14,631,715
Convertible Preferred Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share |  | 11,906,783
Shares Subject to Options to Purchase Common Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share | 1,261,946 | 1,088,221
Shares Subject to Warrants to Purchase Convertible Preferred Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share |  | 472,947
Shares Subject to Warrants to Purchase Common Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share | 156,294 |
Shares Subject to Term Debt Optional Conversion into Convertible Preferred Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share |  | 1,163,764
Shares Subject to Term Debt Optional Conversion into Common Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Total dilutive common shares excluded from calculation of diluted net loss per share | 1,099,278 |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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