Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Stockholders' Equity and Share-Based Compensation - Warrants (Details) - USD ($)
12 Months Ended
Apr. 26, 2017
May 05, 2009
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Aug. 08, 2016
Apr. 27, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expired (in shares)     406,000 121,000      
Warrant              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise price (in dollars per share)   $ 2.14         $ 8.32
Expiration period   7 years          
Warrants outstanding (in shares)     0        
Compensation expense     $ 0 $ 0 $ 0    
Warrants Issued | Warrant              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of warrants issued during the period (in shares)   30,000       10,000 20,000
Expired (in shares) 20,000            
Number of exercisable warrants (in shares)     0