Annual report pursuant to Section 13 and 15(d)

SUBSEQUENT EVENTS Subsequent Events (Details)

v3.20.1
SUBSEQUENT EVENTS Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 11, 2020
Feb. 06, 2020
Feb. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]          
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001
Sale of common stock, net of offering costs       $ 9,919 $ 21,189
Net proceeds from the sale of common stock from underwritten public offering       $ 0 $ 21,190
Subsequent Event          
Subsequent Event [Line Items]          
Sale of common stock, net of offering costs $ 28,800        
Net proceeds from the sale of common stock from underwritten public offering $ 26,300   $ 26,300    
Underwritten Public Offering | Subsequent Event          
Subsequent Event [Line Items]          
Stock issued during period (in shares) 19,166,667 16,666,667      
Common stock, par value (in dollars per share)   $ 0.001      
Share price (in dollars per share)   $ 1.50      
Over-Allotment Option | Subsequent Event          
Subsequent Event [Line Items]          
Stock issued during period (in shares) 2,500,000 2,500,000