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Stockholders' Equity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Dec. 31, 2016
Equity Incentive 2015 Plan          
Weighted Average Grant Date Fair Value Per Share          
Number of shares available for awards 552,886   552,886    
Expiration term of awards         10 years
Equity Incentive 2015 Plan | Maximum          
Weighted Average Grant Date Fair Value Per Share          
Number of shares authorized         1,400,560
Number of additional shares available for future issuance         250,000
Restricted Stock          
Number of Shares          
Nonvested at the beginning of the period (in shares)     8,333    
Vested, including shares withheld to cover taxes (in shares)     (8,333)    
Nonvested at the end of the period (in shares)         8,333
Weighted Average Grant Date Fair Value Per Share          
Nonvested at the beginning of the period (in dollars per share)     $ 12.78    
Vested, including shares withheld to cover taxes (in dollars per share)     $ 12.78    
Nonvested at the end of the period (in dollars per share)         $ 12.78
Additional disclosures          
Stock-based compensation costs which were capitalized     $ 0    
Unrecognized costs related to non-vested stock options awards granted $ 0   $ 0    
Restricted Stock | Minimum          
Shareholders equity          
Vesting period     1 year    
Restricted Stock | Maximum          
Shareholders equity          
Vesting period     5 years    
Restricted Stock Units RSU          
Number of Shares          
Nonvested at the beginning of the period (in shares)     541,346    
Granted (in shares)     485,554    
Vested, including shares withheld to cover taxes (in shares)     (159,910)    
Forfeited (in shares)     (39,208)    
Nonvested at the end of the period (in shares) 827,782   827,782   541,346
Weighted Average Grant Date Fair Value Per Share          
Nonvested at the beginning of the period (in dollars per share)     $ 8.40    
Granted (in dollars per share)     4.05    
Vested, including shares withheld to cover taxes (in dollars per share)     9.16    
Forfeited (in dollars per share)     10.26    
Nonvested at the end of the period (in dollars per share) $ 5.62   $ 5.62   $ 8.40
Additional disclosures          
Unrecognized costs related to non-vested stock awards granted $ 3,400,000   $ 3,400,000    
Weighted average period for recognition of unrecognized compensation costs     2 years 1 month 6 days    
Restricted Stock Units RSU | Employees | Minimum          
Shareholders equity          
Vesting period     3 years    
Restricted Stock Units RSU | Employees | Maximum          
Shareholders equity          
Vesting period     5 years    
restricted stock awards and units          
Additional disclosures          
Stock-based compensation expense $ 400,000 $ 300,000 $ 700,000 $ 700,000  
restricted stock awards and units | Officers          
Shareholders equity          
Vesting period     3 years    
restricted stock awards and units | Directors          
Shareholders equity          
Vesting period     1 year    
Stock Options          
Options Outstanding          
Outstanding at the beginning of the period (in shares)     567,602    
Forfeited or expired (in shares)     (13,687)    
Outstanding at the end of the period (in shares) 553,915   553,915   567,602
Weighted Average Exercise Price          
Outstanding at the beginning of the period (in dollars per share)     $ 5.23    
Forfeited or expired (in dollars per share)     10.37    
Outstanding at the end of the period (in dollars per share) $ 5.10   $ 5.10   $ 5.23
Aggregate Intrinsic Value (in-the-money option)          
Intrinsic value related to options outstanding $ 473,948   $ 473,948    
Closing stock price (in dollars per share) $ 4.31   $ 4.31    
Intrinsic value related to vested options outstanding $ 500,000   $ 500,000    
Weighted Average Remaining Contractual Life          
Weighted Average Remaining Contractual Life     3 years 9 months 18 days    
Additional disclosures          
Stock-based compensation expense 100,000 $ 100,000 $ 100,000 $ 100,000  
Stock-based compensation costs which were capitalized     0    
Unrecognized costs related to non-vested stock options awards granted $ 100,000   $ 100,000    
Weighted average period for recognition of unrecognized compensation costs     1 year 2 months 12 days    
Stock Options Prior to May 2008          
Weighted Average Grant Date Fair Value Per Share          
Expiration term of awards     5 years    
Stock Options Prior to May 2008 | Employees          
Shareholders equity          
Amortization period for fair value of stock options granted (in years)     5 years    
Stock Options Prior to May 2008 | Directors          
Shareholders equity          
Amortization period for fair value of stock options granted (in years)     1 year    
Stock Options after May 2008          
Weighted Average Grant Date Fair Value Per Share          
Expiration term of awards     10 years    
Stock Options after May 2008 | Employees          
Shareholders equity          
Vesting period     5 years    
Stock Options after May 2008 | Directors          
Shareholders equity          
Vesting period     1 year