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Stockholders' Equity - Schedule Of Common Stock Shares Reserved For Future Issuance (Details) - shares | Mar. 31, 2019 | Dec. 31, 2018
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Class Of Stock [Line Items] |  |
Total number of shares reserved for future issuance | 9,577,252 | 8,253,899
Common stock warrants issued and outstanding |  |
Class Of Stock [Line Items] |  |
Total number of shares reserved for future issuance | 4,857 | 4,857
Options Issued and Outstanding |  |
Class Of Stock [Line Items] |  |
Total number of shares reserved for future issuance | 1,885,914 | 2,094,137
Unvested restricted stock units |  |
Class Of Stock [Line Items] |  |
Total number of shares reserved for future issuance | 896,759 | 547,891
Shares Available for Grant Under Future Stock Plans |  |
Class Of Stock [Line Items] |  |
Total number of shares reserved for future issuance | 6,789,722 | 5,607,014

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- Definition Aggregate number of common 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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