v3.19.2
Stockholders’ Equity - Share Based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2019
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (usd per share) $ 10.98 $ 10.98      
Time-Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated stock-based compensation $ 3.9        
Restricted stock units granted (shares)   800,000      
Performance-Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted (shares) 300,000 300,000      
Award vesting period   2 years   2 years 3 years
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted (shares)   1,114,000      
Purchase price for vested RSUs (usd per share) $ 0.001 $ 0.001      
Settled (RSUs) (usd per share)   $ 13.52      
Unrecognized compensation cost $ 23.1 $ 23.1      
Unrecognized compensation cost, period for recognition   2 years 1 month 28 days      
Restricted Stock Units and Performance-Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Settled (RSUs) (usd per share)   $ 13.52 $ 9.60    
Total fair value of vested RSUs   $ 5.2 $ 3.5    
Intrinsic value of options exercised and RSUs vested   $ 10.8 $ 12.8    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (shares)   0 100,000    
Weighted average exercise price (usd per share)   $ 0.00 $ 17.44    
The aggregate fair value of the options vested   $ 1.2 $ 1.2    
Unrecognized compensation cost $ 3.2 $ 3.2      
Unrecognized compensation cost, period for recognition   1 year 7 months 20 days      
Total shares of common stock reserved for future issuance 14,195,000 14,195,000      
2014 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total shares of common stock reserved for future issuance 3,411,000 3,411,000      
Research and development | Time-Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated stock-based compensation $ 3.9 $ 3.9