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STOCK-BASED COMPENSATION - Narrative (Details)
$ in Thousands
9 Months Ended
Oct. 10, 2016
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for award (in shares) | shares   20,803,838  
Exercise price as percentage of fair market value 1    
Options expiration period 10 years    
Number of common stock shares for each restricted stock unit and restricted stock unit award (in shares) | shares   1  
Exercises in period, intrinsic value   $ 1,200 $ 100
Aggregate intrinsic value, vested   300 200
Proceeds from exercise of stock options   330 $ 112
Option, cost not yet recognized   $ 1,100  
Nonvested award, unrecognized, period for recognition   2 years 9 months 18 days  
Expected dividend yield   0.00% 0.00%
Granted (in shares) | shares   0  
Award requisite service period   4 years  
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested award, unrecognized, period for recognition   3 years 4 months 24 days  
Grants in period, vested, grant date fair value   $ 100 $ 100
Nonvested award, excluding options, unrecognized   $ 4,500  
Granted (in shares) | shares   3,379,467  
Restricted Stock Units, Service And Performance Based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested award, excluding options, unrecognized   $ 12,600  
Granted (in shares) | shares   2,700,000