Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity and Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options granted (in shares)     554,000  
Number of options exercised (in shares)     0  
Number of stock options forfeited (in shares)     137,000  
Number of stock options expired (in shares)     697,000  
Time Based RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (in shares)     366,000  
Performance based RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (in shares)     131,000  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (in shares)     497,000  
Shares withheld to satisfy employee tax obligations (in shares)     184,000  
Adjustment related employee tax obligations     $ 430  
Compensation expense $ 580 $ 574 1,739 $ 2,242
Unrecognized compensation expense $ 4,147   $ 4,147