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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
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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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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