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Employee Share-Based Compensation (Details)
 3 Months Ended
Apr. 01, 2017
USD ($)
$ / shares
shares
Service Period Based Stock Options  
Outstanding at Beginning of Period | shares 4,281,151
Options Granted | shares 553,334
Options Exercised | shares (3,202)
Options Forfeited | shares (3,271)
Outstanding at End of Period | shares 4,828,012
Exercisable at End of Period | shares 3,246,220
Weighted Average Exercise Price  
Outstanding at Beginning of Period $ 3.52
Options Granted 2.78
Options Exercised 2.07
Options Forfeited 3.57
Outstanding at End of Period 3.44
Exercisable at End of Period $ 3.41
Weighted Average Remaining Contractual Term  
Outstanding at Beginning of Period 6 years 4 months 10 days
Options Granted 10 years
Outstanding at End of Period 6 years 6 months 2 days
Exercisable at End of Period 5 years 2 months 2 days
Weighted Average Fair Value  
Weighted Average Fair Value Option Granted $ 1.80
Aggregate Intrinsic Value  
Exercised | $ $ 3,000
Outstanding at End of Period | $ 375,000
Exercisable at End of Period | $ $ 361,000