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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
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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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

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