Stockholders’ Equity - Shares Reserved for Issuance (Details) - shares |
Jun. 30, 2018 |
Dec. 30, 2017 |
|---|---|---|
| Employee Stock Option | ||
| Class of Stock [Line Items] | ||
| Options issued and outstanding | 4,002,000 | 4,486,000 |
| Common stock available for stock-based award grants under incentive award plans | 13,971,000 | |
| Restricted stock units | ||
| Class of Stock [Line Items] | ||
| Restricted stock units issued and outstanding | 2,514,000 | 1,850,000 |
| 2014 Plan | ||
| Class of Stock [Line Items] | ||
| Common stock available for stock-based award grants under incentive award plans | 2,540,000 | |
| Common Stock | ||
| Class of Stock [Line Items] | ||
| Common stock available for conversion of Series A Redeemable Convertible Preferred Stock | 4,915,000 |