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SHARE-BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Number of Shares under Option (in thousands)    
Outstanding at beginning of period (in shares) 15,703,000  
Granted (in shares) 1,080,000  
Exercised (in shares) 0  
Canceled or forfeited (in shares) 0  
Outstanding at end of period (in shares) 16,783,000 15,703,000
Exercisable at end of period (in shares) 8,513,000  
Weighted-Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 1.93  
Granted (in dollars per share) 0.71  
Exercised (in dollars per share) 0  
Cancelled or forfeited (in dollars per share) 0  
Outstanding at end of period (in dollars per share) 1.85 $ 1.93
Exercisable at end of period (in dollars per share) $ 1.68  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted-average Remaining Contractual Life (in years), Outstanding 7 years 11 months 1 day 8 years 10 days
Weighted-average Remaining Contractual Life (in years), Exercisable 7 years 3 months 3 days  
Aggregate Intrinsic Value, Outstanding $ 1 $ 82
Aggregate Intrinsic Value, Exercisable $ 1