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Common Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares shares in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 93,210 | 75,735
2019 Plan |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 39,641 | 24,539
Options |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 16,833 | 18,186
Outstanding and unsettled restricted stock units (RSUs) |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 8,447 | 7,808
Shares available for issuance under the ESPP |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 8,317 | 5,230
Convertible senior notes |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 19,972 | 19,972

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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=120391452&loc=d3e13212-122682 + Details
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