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Common Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares shares in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 93,218 | 76,226
2019 Plan |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 45,931 | 30,761
Stock Options |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 12,743 | 13,603
Outstanding and unsettled restricted stock units |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 7,437 | 7,417
Shares available for issuance under the Employee Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 11,293 | 8,056
Convertible Debt | 2025 Notes |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 5,503 | 6,078
Convertible Debt | 2026 Notes |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 10,311 | 10,311

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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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