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Employee Benefit Plans and Stockholders' Equity - Stock Options Reserved for Future Issuance (Details) - shares shares in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Share-based Payment Arrangement [Abstract] |  |
Unvested restricted stock units (shares) | 1.2 | 1.8
Reserved for future grant (shares) | 4.5 | 4.9
Employee Stock Purchase Plan (shares) | 0.8 | 0.9
Total (shares) | 6.5 | 7.6

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- Definition Employee Stock Purchase Plan ESPP Shares In ESPP + References No definition available. + Details
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- Definition Number of stock options and awards reserved for future grant + References No definition available. + Details
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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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- References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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