Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Stock Incentive Plan (Details)

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STOCK BASED COMPENSATION - Stock Incentive Plan (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2022
shares
Dec. 31, 2020
shares
Jul. 31, 2020
USD ($)
employee
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2019
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     4 years        
Cliff Vesting Period     1 year        
Number of employees affected by repricing | employee     116        
Expenses recognized | $     $ 3.6 $ 8.6 $ 0.8    
Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)       0 0    
2015 stock incentive plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards made under the plan             26,283,789
Expiration period             10 years
Vesting period             4 years
Make Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiration period           10 years  
Vesting period           4 years  
Options and warrants to be issued           232,304  
Granted (in shares)           0  
2020 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock available for future issuance   12,400,813          
Percentage of stock outstanding   5.00%          
Additional shares added to the plan 15,573,698