Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Issuance (Details) shares in Thousands |
Dec. 31, 2020
shares
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|---|---|---|---|---|
| Class Of Stock [Line Items] | ||||
| Total reserved shares of common stock | 39,597 | |||
| Equity Incentive Plan | ||||
| Class Of Stock [Line Items] | ||||
| Common stock awards granted under equity incentive plans | 13,088 | |||
| 2017 Employee Stock Purchase Plan | ||||
| Class Of Stock [Line Items] | ||||
| Common stock awards available for issuance | 5,089 | [1] | ||
| 2017 Plan | ||||
| Class Of Stock [Line Items] | ||||
| Common stock awards available for issuance | 21,420 | |||
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