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Stockholders' Equity - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 06, 2019
Additional Disclosures for equity-based plans |  |  |  |
Shares available for grant (in shares) | 12,000,000 |  |  |
Issuance of common stock under ESPP (in shares) | 175,966 | 224,928 | 283,644 |
Outstanding common stock authorized to be repuchased | $ 0 | $ 120,000,000 | $ 100,000,000 |
Remaining authorized amount of outstanding common stock available for repuchase | $ 75,000,000 |  |  |
Number of shares repurchased (in shares) | 1,190,995 | 1,549,434 | 3,414,675 |
Stock Options |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Vesting period | 4 years |  |  |
Stock Options | Nonemployee directors | Maximum |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Contractual term | 10 years |  |  |
Time-Based RSUs and RSAs |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Vesting period | 4 years |  |  |
Time-Based RSUs and RSAs | Minimum |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Percent of share value | 0.00% |  |  |
Time-Based RSUs and RSAs | Maximum |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Percent of share value | 200.00% |  |  |
Performance-Based RSUs and RSAs | 2018 |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Vesting period | 1 year |  |  |
Amount of shares that are expected to vest( as a percent ) | 50.00% |  |  |
ESPP |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Shares available for grant (in shares) | 3,000,000 |  |  |
Employee Stock Purchase Plan |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Stock options granted percentage of fair market value on offering date | 85.00% |  |  |
Stock options granted percentage of fair market value on purchase date | 85.00% |  |  |
Employee Stock Purchase Plan | Minimum |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Employee earnings contribution percentage | 1.00% |  |  |
Employee Stock Purchase Plan | Maximum |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Employee earnings contribution percentage | 15.00% |  |  |
Subsequent Event |  |  |  |
Additional Disclosures for equity-based plans |  |  |  |
Outstanding common stock authorized to be repuchased |  |  |  | $ 300,000,000

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