Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Share-Based Compensation Plan Information (Details)

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Stockholders' Equity and Share-Based Compensation - Share-Based Compensation Plan Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 31, 2016
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of options granted (in dollars per share)   $ 1.65 $ 1.19 $ 1.34
Intrinsic value, options exercised   $ 599 $ 346 $ 153
Unrecognized share-based compensation expense   $ 1,344    
Weighted-average period of unrecognized compensation expense   2 years 4 months 2 days    
Shares related to the net settlement of the stock options   0 112,000  
2016 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares authorized to issued under condition one 2,500,000      
Shares available for future grants (in shares) 3,894,000 6,307,000    
Share reserve increase period (in shares) 9 years      
Share reserve (in shares) 1,500,000      
Expiration period 10 years      
Option grant vesting period 4 years      
Exercise price of option grants 100.00%      
2007 Omnibus Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares authorized to issued under condition one   1,500,000    
Shares available for future grants (in shares)   0    
Expiration period   10 years    
Option grant vesting period   4 years    
Exercise price of option grants   100.00%    
Common stock authorized (in shares)   2,400,000    
Maximum percentage of shares authorized to issued under condition one   5.00%    
2007 New Employee Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   0    
Expiration period   10 years    
Option grant vesting period   4 years    
Exercise price of option grants   100.00%    
Common stock authorized (in shares)   2,000,000    
2006 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   0    
Equity Incentive Plan 2014        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of options granted (in dollars per share)   $ 0.55 $ 0.55 $ 0.56
Unrecognized share-based compensation expense   $ 224    
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares withheld to satisfy employees' tax obligation (in shares)   0 27,000  
Employees' tax obligation   $ 0 $ 80  
Employee Stock Option | Equity Incentive Plan 2014        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   1,000    
Weighted-average period of unrecognized compensation expense   2 years 2 months 12 days