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SUBSEQUENT EVENTS - (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Oct. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Subsequent Event [Line Items]        
Common stock, shares, issued (in shares)   130,273,504   100,735,889
Proceeds from issuance of shares   $ 44,642 $ 14,696  
At the Market Program | Subsequent Event        
Subsequent Event [Line Items]        
Common stock, shares, issued (in shares) 800,000      
Price per share (in USD per share) $ 1.72      
Proceeds from issuance of shares $ 1,350