Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Stock Incentive Plan (Details)

v3.21.2
STOCK BASED COMPENSATION - Stock Incentive Plan (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 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     $ 8.8   $ 8.8      
Weighted-average period         2 years 8 months 12 days      
Shares available for grant     17,933,802   17,933,802      
Consultant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of shares           $ 0.1    
Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)     0 2,269,131 0 6,925,144    
Fair value of shares       $ 26.1   $ 29.8    
Non-employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)     0 0 0      
Non-employee | Consultant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)           12,212    
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%            
Additional shares added to the plan 11,337,837