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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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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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