Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Employee Stock Option Plans (Details)

v3.20.4
STOCK-BASED COMPENSATION - Employee Stock Option Plans (Details)
12 Months Ended
Dec. 31, 2020
plan
shares
STOCK-BASED COMPENSATION  
Number of stock option plans | plan 2
Number of shares of common stock authorized (in shares) 27,260,463
Employee stock option  
STOCK-BASED COMPENSATION  
Expiration period 10 years
Options exercised during the period (in shares) 761,541
2018 Equity Incentive Plan | Employee stock option  
STOCK-BASED COMPENSATION  
Expiration period 10 years
Number of shares of common stock authorized (in shares) 40,914,675
Inducement Plan | Employee stock option  
STOCK-BASED COMPENSATION  
Number of shares of common stock authorized (in shares) 1,283,333
Inducement Plan | Employee stock option | Maximum  
STOCK-BASED COMPENSATION  
Expiration period 10 years