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STOCKHOLDERS’ DEFICIT AND STOCK-BASED COMPENSATION - Stock Options Activity (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Number of options    
Beginning balance (in shares) 5,832,519  
Granted (in shares) 237,500  
Exercised (in shares) 0  
Forfeited (in shares) (164,235)  
Ending balance (in shares) 5,905,784 5,832,519
Vested and expected to vest (in shares) 5,905,784  
Exercisable (in shares) 4,282,866  
Weighted Average Exercise Price    
Beginning balance (in dollars per share) $ 3.30  
Granted (in dollars per share) 10.00  
Ending balance (in dollars per share) 3.56 $ 3.30
Vested and expected to vest (in dollars per share) 3.56  
Exercisable (in dollars per share) $ 3.00  
Weighted Average Remaining Contractual Life    
Options outstanding, weighted average remaining contractual life 5 years 6 months 21 days 5 years 7 months 13 days
Granted , weighted average remaining contractual life 9 years 11 months 15 days  
Options vested and expected to vest, outstanding, weighted average remaining contractual life 5 years 6 months 21 days  
Options exercisable, weighted average remaining contractual life 4 years 5 months 23 days