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Stock Based Compensation - Omnibus Incentive Plan (Details) - Omnibus Plan - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Oct. 31, 2015
Weighted-Average Grant Date Fair Value            
Compensation expense   $ 9 $ (42) $ 317 $ 741  
Stock Options            
Stock based compensation            
Number of shares authorized 1,200,000         800,000
Number of additional shares authorized 400,000          
Number of shares available for grant   228,555   228,555    
Stock options granted (in shares)       0    
Number of shares            
Balance at beginning of year (in shares)       910,627    
Granted (in shares)       0    
Forfeited (in shares)       (69,808)    
Balance at end of year (in shares)   840,819   840,819    
Options: Options vested and exercisable   517,794   517,794    
Options: Options vested and expected to vest   840,819   840,819    
Weighted-Average Exercise Price            
Balance at beginning of year (in dollars per share)       $ 14.99    
Granted (in dollars per share)     $ 1.20      
Forfeited (in dollars per share)       12.45    
Balance at end of year (in dollars per share)   $ 15.20   15.20    
Weighted-Average Exercise Price: Options vested and exercisable   16.57   16.57    
Weighted-Average Exercise Price: Options vested and expected to vest   $ 15.20   $ 15.20    
Weighted- Average Remaining Contractual Term (in Years)            
Balance (in years)       7 years 7 months 13 days    
Weighted-Average Remaining Contractual Term (in Years): Options vested and exercisable       7 years 6 months 7 days    
Weighted-Average Remaining Contractual Term (in Years): Options vested and expected to vest       7 years 7 months 13 days    
Number of unvested options scheduled to vest            
Non-Vested Options as of beginning of period       605,352    
Granted (in shares)       0    
Forfeited (in shares)       (51,567)    
Vested (in shares)       (230,760)    
Non-Vested Options as of end of period   323,025   323,025    
Weighted-Average Grant Date Fair Value            
Non-Vested, beginning balance       $ 3.14    
Forfeited: Weighted-Average Grant Date Fair Value       3.25    
Vested: Weighted-Average Grant Date Fair Value       2.28    
Non-Vested, ending balance   $ 3.74   $ 3.74    
2019 | Stock Options            
Number of unvested options scheduled to vest            
Non-Vested Options as of end of period   45,345   45,345    
2020 | Stock Options            
Number of unvested options scheduled to vest            
Non-Vested Options as of end of period   225,980   225,980    
2021 | Stock Options            
Number of unvested options scheduled to vest            
Non-Vested Options as of end of period   51,700   51,700