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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
shares
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
shares
Jul. 01, 2017
USD ($)
Jun. 29, 2018
$ / shares
May 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Closing price of common stock (in usd per share) | $ / shares         $ 9.93  
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units granted (in shares) 200,000   3,344,000      
Amortization of stock-based compensation | $ $ 8.0 $ 15.4 $ 8.4 $ 16.0    
PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units granted (in shares)     505,000      
Performance stock unit grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amortization of stock-based compensation | $ $ 2.6 $ 4.7 $ 2.8 $ 4.6    
2016 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in shares authorized (in shares)           1,500,000.0
Reserved common stock for issuance of options (in shares) 15,400,000   15,400,000      
2016 Plan maximum term     10 years      
2016 Equity Incentive Plan | PSUs | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ranges of number of shares issued on vesting of PSUs     0      
2016 Equity Incentive Plan | PSUs | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ranges of number of shares issued on vesting of PSUs     2.0      
2016 Equity Incentive Plan | PSUs | Existing employees | Vesting 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     1 year      
2016 Equity Incentive Plan | PSUs | Existing employees | Vesting 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     2 years      
2016 Equity Incentive Plan | PSUs | Existing employees | Vesting 3            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     3 years      
2007 Equity Incentive Plan | PSUs | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ranges of number of shares issued on vesting of PSUs     0      
2007 Equity Incentive Plan | PSUs | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ranges of number of shares issued on vesting of PSUs     2.0      
2007 Equity Incentive Plan | PSUs | Existing employees | Vesting 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     1 year      
2007 Equity Incentive Plan | PSUs | Existing employees | Vesting 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     2 years      
2007 Equity Incentive Plan | PSUs | Existing employees | Vesting 3            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Duration of grants based on shareholder return of common stock price versus designated index     3 years