Annual report pursuant to Section 13 and 15(d)

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

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STOCK-BASED COMPENSATION - Employee Stock Option Plans (Details)
12 Months Ended
Dec. 31, 2018
plan
shares
STOCK-BASED COMPENSATION  
Number of stock option plans | plan 2
Number of shares of common stock authorized (in shares) 20,713,331
Employee stock option  
STOCK-BASED COMPENSATION  
Expiration period 10 years
Options exercised during the period (in shares) 1,172,615
2018 Equity Incentive Plan | Employee stock option  
STOCK-BASED COMPENSATION  
Expiration period 10 years
Number of shares of common stock authorized (in shares) 34,174,470
Inducement Plan | Employee stock option  
STOCK-BASED COMPENSATION  
Number of shares of common stock authorized (in shares) 1,635,875
Inducement Plan | Employee stock option | Maximum  
STOCK-BASED COMPENSATION  
Expiration period 10 years