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Preferred Stock and Common Stock -Schedule of Number of Shares of Common Stock Reserved for Future Issuance (Details) - shares | Mar. 31, 2019 | Dec. 31, 2018
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Class Of Stock [Line Items] |  |
Number of shares of common stock reserved for future issuance | 4,176,015 | 2,773,249
Options Issued and Outstanding |  |
Class Of Stock [Line Items] |  |
Number of shares of common stock reserved for future issuance | 1,706,317 | 1,122,677
Unvested Restricted Stock Units |  |
Class Of Stock [Line Items] |  |
Number of shares of common stock reserved for future issuance | 24,960 | 24,960
Options Available for Future Grants |  |
Class Of Stock [Line Items] |  |
Number of shares of common stock reserved for future issuance | 1,889,155 | 1,350,582
Shares Available for Issuance under the 2018 ESPP |  |
Class Of Stock [Line Items] |  |
Number of shares of common stock reserved for future issuance | 555,583 | 275,030

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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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