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Stockholders' Equity - ESPP (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jan. 01, 2018 | Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares of common stock reserved for future issuance (in shares) | 14,764,000 |  |
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Maximum employee subscription rate, percentage of pre-tax earnings | 15.00% |  |
Purchase price of shares, percentage of the fair market value of the Company's common stock | 85.00% |  |
Maximum number of shares per employee per purchase period | 1,500 |  |
Shares of common stock reserved for future issuance (in shares) | 1,371,000 |  | 880,000
Automatic annual increase in common stock reserved for issuance, percentage | 1.00% |  |
Maximum annual increase of shares reserved | 1,000,000 |  |
Issuance of common stock under ESPP, shares | 265,172 |  |
Weighted-average price per share | $ 15.47 |  |
ESPP | Subsequent Event |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares of common stock reserved for future issuance, additional shares |  | 566,316 |

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