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Convertible Preferred Stock and Stockholders' Equity - Schedule of Common Stock Reserved (Details) - shares | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Class Of Stock [Line Items] |  |
Shares of common stock reserved | 3,657,356 | 2,575,769
Shares Subject to Options to Purchase Common Stock |  |
Class Of Stock [Line Items] |  |
Shares of common stock reserved | 2,645,714 | 1,320,197
Unvested Restricted Stock Units |  |
Class Of Stock [Line Items] |  |
Shares of common stock reserved | 249,500 |
Shares Subject to Warrants to Purchase Common Stock |  |
Class Of Stock [Line Items] |  |
Shares of common stock reserved | 956 | 156,294
Shares Subject to Term Debt Optional Conversion into Common Stock |  |
Class Of Stock [Line Items] |  |
Shares of common stock reserved | 761,186 | 1,099,278

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- Definition Aggregate number of nonredeemable convertible preferred shares reserved for future issuance. + 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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