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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)     $ 3.99   $ 1.77  
Number of options (in shares) 1,103,004   1,103,004   1,609,087 1,487,433
Outstanding options, weighted average exercise price (in dollars per share) $ 2.98   $ 2.98   $ 2.91 $ 3.43
Share-based compensation $ 513 $ 670 $ 1,703 $ 2,370    
Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares authorized (in shares) 15,449,408   15,449,408      
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     2 years      
Award exercise period     5 years      
Exercisable options, weighted average remaining contractual term     2 years 3 months      
Number of exercisable options (in shares) 888,627   888,627      
Exercisable options, weighted average exercise price (in dollars per share) $ 3.06   $ 3.06      
Options, vested and expected to Vest, aggregate intrinsic value $ 3,540   $ 3,540      
Share-based compensation 42 134 281 $ 508    
Unrecognized compensation costs related to unvested stock options     $ 100      
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     1 year 3 months 10 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     2 years 6 months 14 days      
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Granted, nonvested, number of shares (in shares)     440,000 740,000    
Grants in period, grant date intrinsic value (in dollars per share)     $ 2,670,000 $ 1,970,000    
Share-based compensation 409 306 $ 1,162 $ 986    
Unrecognized compensation costs related to RSU awards     $ 1,080      
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     1 year 10 months 13 days      
Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period           5 years
Number of grants in period (in shares)           2,200,000
Grants in period, weighted average exercise price (in dollars per share)           $ 1.25
Granted, nonvested, number of shares (in shares)     0   0  
Share-based compensation $ 62 $ 230 $ 260 $ 876    
Unrecognized compensation costs related to RSU awards     $ 10      
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     21 days      
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)     $ 7.14   $ 3.06  
Outstanding options, weighted average exercise price (in dollars per share) $ 7.42   7.42   $ 15.61 15.61
Exercisable options, weighted average exercise price (in dollars per share) $ 7.42   $ 7.42      
Maximum | Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercisable options, weighted average remaining contractual term     10 years      
Share-based Compensation Award, Tranche One | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)           $ 5.00
Period of exercise price           90 days
Share-based Compensation Award, Tranche Two | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)           $ 7.00
Period of exercise price           90 days
Share-based Compensation Award, Tranche Three | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)           $ 10.00
Period of exercise price           90 days
Common Stock | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share)           $ 2.92