Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Share-Based Compensation - Narrative (Details)

v3.19.1
Stockholders' Equity and Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock options granted (in shares) 3,290,000  
Number of options exercised (in shares) 0  
Number of stock options forfeited (in shares) 1,250,000  
Number of stock options expired (in shares) 711,000  
Time Based RSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested (in shares) 191,000  
Performance based RSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested (in shares) 44,000  
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested (in shares) 803,000  
Shares withheld to satisfy employee tax obligations (in shares) 284,000  
Adjustment related employee tax obligations $ 287  
Compensation expense 554 $ 1,003
Unrecognized compensation expense $ 2,680