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Employee Share-Based Compensation (Tables)
 3 Months Ended
Apr. 01, 2017
Share-based Compensation Tables  
Service Period Based Stock Options
          Weighted Average        
                Remaining           Aggregate  
    Number of     Exercise     Contractual     Fair     Intrinsic  
    Shares     Price     Term     Value     Value  
Outstanding at December 31, 2016     4,281,151     $ 3.52       6.36              
                                     
Options Granted     553,334       2.78       10.00     $ 1.80        
Options Exercised     (3,202 )     2.07                     $ 3,000  
Options Forfeited     (3,271 )     3.57                          
Outstanding at April 1, 2017     4,828,012     $ 3.44       6.55             $ 375,000  
                                         
Exercisable at April 1, 2017     3,246,220     $ 3.41       5.21             $ 361,000  
Weighted average assumptions of stock options granted
Three Months Ended April 1, 2017      
Expected term     5.8 years  
Expected volatility     73 %
Expected dividends     0.00 %
Risk-free rate     2.20 %