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Stock-Based Compensation - Shares Reserved for Future Issuance (Details) - shares shares in Thousands | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Common Stock Reserved for Future Issuance |  |
Total | 13,329 |
2001 Stock Plan |  |
Common Stock Reserved for Future Issuance |  |
Stock options issued and outstanding (in shares) | 413 |
2011 Stock Plan |  |
Common Stock Reserved for Future Issuance |  |
Stock options issued and outstanding (in shares) | 1,384 |
2015 Stock Plan |  |
Common Stock Reserved for Future Issuance |  |
Stock options issued and outstanding (in shares) | 4,786 |
Authorized for future stock awards or option grants (in shares) | 5,405 |
Total |  | 13,500
Employee Stock Purchase Plan 2015 |  |
Common Stock Reserved for Future Issuance |  |
Authorized for future stock awards or option grants (in shares) | 1,341 |
Total |  | 1,800

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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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