Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Series A Convertible Preferred Stock (Details)

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Stockholders' Equity and Share-Based Compensation - Series A Convertible Preferred Stock (Details) - Series A Convertible Preferred Stock
 12 Months Ended
Apr. 05, 2013
USD ($)
shares
Mar. 25, 2013
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
vote
$ / shares
shares
Jan. 02, 2016
USD ($)
$ / shares
shares
Jan. 03, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Series A convertible preferred stock, shares authorized | shares   4,150,000 4,150,000 4,150,000  
Aggregate shares to be sold | shares   4,150,000      
Series A convertible preferred stock, par value | $ / shares   $ 0.001 $ 0.001 $ 0.001  
Preferred stock purchase price per share | $ / shares   $ 1.45      
Preferred stock purchase, amount   $ 6,017,000      
Preferred stock sold | shares 150,000 4,000,000      
Aggregate proceeds of preferred stock $ 217,000 $ 5,800,000      
Issuance costs incurred to company $ 847,000        
Conversion rate of common stock for each share of Series A preferred stock | shares     1    
Consecutive trading days for calculating weighted average price for the common stock     30 days    
Minimum common stock price for consecutive thirty trading days for stock conversion | $ / shares     $ 4.35    
Percentage of changes of control of company and sales or other dispositions by company (more than)     50.00%    
Amount per share to series A preferred in case of liquidation (in dollars per share) | $ / shares     $ 1.45 $ 1.45  
Preferred stock annual dividend rate (in dollars per share) | $ / shares     $ 0.058    
Votes per share | vote     1    
Cash dividends on amended credit     $ 400,000    
Dividends     $ 241,000 $ 241,000 $ 240,000
Issuance of common stock in connection with preferred stock dividends (in shares) | shares     37,000 103,000 83,000
Common stock dividends during the period     $ 61,000 $ 0 $ 0