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Common Stock - Reserved for Future Issuance (Details) - shares | Dec. 31, 2018 | Aug. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 37,219,376 |  | 89,292,466
2014 Equity Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 0 |  | 3,962,024
2018 Equity Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 10,558,306 | 10,701,505 | 0
2018 Employee Stock Purchase Plan |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 1,700,000 | 1,700,000 | 0
Warrant to purchase redeemable convertible preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 0 |  | 398,331
Warrant to purchase common stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 898,331 |  | 45,286
Conversion of redeemable convertible preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 0 |  | 61,279,079
Options issued and outstanding |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 23,774,279 |  | 23,607,746
RSUs issued and outstanding |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares reserved for future issuance (in shares) | 288,460 |  | 0

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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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