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Common Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares shares in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 61,057 | 63,284
2019 Plan |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 26,936 | 29,048
Options |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 21,269 | 21,191
Outstanding and unsettled restricted stock units (RSUs) |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 6,982 | 7,175
ESPP |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved (in shares) | 5,870 | 5,870

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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=6877327&loc=d3e13212-122682 + Details
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