Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Stock Incentive Plan (Details)

v3.21.1
STOCK BASED COMPENSATION - Stock Incentive Plan (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense, stock options   $ 12.5      
Weighted-average period   3 years 1 month 6 days      
Shares available for grant   14,140,956      
Consultant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     12,212    
Fair value of shares     $ 0.1    
Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   0 473,624    
Fair value of shares     $ 0.8    
Non-employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   0      
2015 stock incentive plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards made under the plan         26,283,789
Vesting period         4 years
Expiration period         10 years
Make Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       4 years  
Expiration period       10 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%