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STOCKHOLDERS' EQUITY - Compensation Plan (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2018
$ / shares
Nov. 30, 2018
$ / shares
Jan. 31, 2015
$ / shares
Jan. 31, 2015
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Information related to compensation cost              
Stock based compensation expense | $           $ 0.5  
Unrecognized compensation expense | $           4.7  
Employee Stock Purchase 2015 Plan              
Information related to compensation cost              
Purchase price for initial subscription (in dollars per share) | (per share)     $ 2.63 $ 38.44      
Percentage of title acquired by employee in every two years on shares paid in previous two years         50.00%    
Period of plan         8 years    
Ratio of bonus shares granted to participant         0.1    
Stock based compensation expense | $         $ 0.5 0.4  
Unrecognized compensation expense | $         $ 1.5 $ 2.2  
Stock award activity, Shares              
Outstanding shares at the beginning of the period | shares         1,379,734 1,840,336 1,840,336
Exercised (in shares) | shares         (54,221) (437,386)  
Outstanding shares at the end of the period | shares         1,325,513 1,402,950 1,379,734
Unit Weighted Average Grant Date Fair Value              
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares         $ 2.63 $ 2.63 $ 2.63
Exercised (in dollars per share) | $ / shares         2.63 2.63  
Outstanding shares at the end of the period (in dollars per share) | $ / shares         $ 2.63 $ 2.63 $ 2.63
Employee Stock Purchase 2018 Plan              
Information related to compensation cost              
Purchase price for initial subscription (in dollars per share) | (per share) $ 1.86 $ 37.89          
Percentage of title acquired by employee in every two years on shares paid in previous two years         50.00%    
Period of plan         8 years    
Ratio of bonus shares granted to participant         0.1    
Stock based compensation expense | $         $ 0.5    
Unrecognized compensation expense | $         $ 4.0    
Stock award activity, Shares              
Outstanding shares at the beginning of the period | shares         4,002,898 2,782,424 2,782,424
Granted (in shares) | shares           1,238,169  
Exercised (in shares) | shares         (37,940)    
Outstanding shares at the end of the period | shares         3,964,958 4,020,593 4,002,898
Unit Weighted Average Grant Date Fair Value              
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares         $ 1.86 $ 1.86 $ 1.86
Granted (in dollars per share) | $ / shares           1.86  
Exercised (in dollars per share) | $ / shares         1.86    
Outstanding shares at the end of the period (in dollars per share) | $ / shares         $ 1.86 $ 1.86 $ 1.86