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STOCK-BASED COMPENSATION - 2015 EIP Stock Options and Other (Details) - 2015 EIP Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 25, 2020
Nov. 05, 2019
Mar. 04, 2019
Feb. 27, 2018
Mar. 23, 2017
Oct. 15, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 22, 2017
Jun. 26, 2015
Stock options                      
Aggregate number of shares of common stock available for awards         2,750,000         400,000 400,000
Nonemployee Directors                      
Additional disclosures                      
Maximum annual limit for grants (in shares)         500,000            
Other Individuals                      
Additional disclosures                      
Maximum annual limit for grants (in shares)         1,000,000            
Stock Options                      
Stock options                      
Vesting percentage of awards 33.33%   33.33% 33.33%              
Vesting period 3 years   3 years 3 years              
Unrecognized compensation cost                      
Unamortized compensation cost             $ 490        
Future amortization of stock based compensation                      
2021             367        
2022             111        
2023             $ 12        
Number of Options                      
Outstanding at beginning of period (in shares)             322,279 166,942 88,667    
Granted (in shares) 344,568   240,540 122,608     344,568 240,540 122,608    
Exercisable (in shares)             (119,923) (85,203) (44,333)    
Forfeited (in shares)             (3,378)        
Outstanding at end of period (in shares)             543,546 322,279 166,942    
Weighted Average Exercise Price                      
Outstanding at beginning of period (in dollars per share)             $ 9.41 $ 13.01 $ 11.13    
Granted (in dollars per share) $ 7.06   $ 8.065 $ 13.365     7.06 8.33 13.69    
Exercisable (in dollars per share)             9.87 12.36 11.13    
Forfeited (in dollars per share)             8.07        
Outstanding at end of period (in dollars per share)             7.83 9.41 13.01    
Weighted Average Fair Value                      
Outstanding at beginning of period (in dollars per share)             4.72 7.25 6.41    
Granted (in dollars per share) $ 2.01   $ 3.76 $ 7.55     2.01 3.76 7.55    
Exercisable (in dollars per share)             5.05 6.96 6.41    
Forfeited (in dollars per share)             3.76        
Outstanding at end of period (in dollars per share)             2.94 $ 4.72 $ 7.25    
Weighted Average Exercise Price Of Outstanding Options             $ 8.86        
Options Outstanding, Weighted Average Remaining Contractual Life             4 years 8 months 19 days        
Options Exercisable, Number of options             293,792        
Options Exercisable, Weighted Average Exercise Price             $ 10.78        
Options Exercisable, Weighted Average Remaining Contractual Life             3 years 3 days        
Aggregate fair value $ 693   $ 904 $ 926              
Stock options outstanding - nonvested and exercisable             837,338 496,148      
Assumptions and Methodology                      
Weighted average volatility rate (as a percent) 53.91%   55.23% 71.94%              
Risk-free interest rate ( as a percent) 1.41%   2.49% 2.53%              
Dividend rate ( as a percent) 7.13%   0.00% 0.00%              
Expected life (in years) 4 years   4 years 4 years              
Stock Options | General and Administrative Expense                      
Stock options                      
Amortization expense             $ 787 $ 850 $ 731    
Stock Options | Exercise Price - $13.365                      
Weighted Average Exercise Price                      
Granted (in dollars per share)   $ 13.365                  
Stock Options | Exercise Price - $8.065                      
Weighted Average Exercise Price                      
Granted (in dollars per share)   8.065                  
Stock Options | Exercise Price - $7.06                      
Weighted Average Exercise Price                      
Granted (in dollars per share) $ 7.06                    
Stock Options | John C. Wobensmith                      
Stock options                      
Vesting percentage of awards         33.33%            
Vesting period           3 years          
Number of Options                      
Granted (in shares)         133,000            
Weighted Average Exercise Price                      
Granted (in dollars per share)   $ 10.805                  
Weighted Average Fair Value                      
Granted (in dollars per share)         $ 6.41            
Aggregate fair value         $ 853            
Assumptions and Methodology                      
Weighted average volatility rate (as a percent)         79.80%            
Risk-free interest rate ( as a percent)         1.68%            
Dividend rate ( as a percent)         0.00%            
Expected life (in years)         3 years 9 months 10 days