Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Common Stock (Details)

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STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
May 18, 2018
May 17, 2018
Controlled Equity Offering            
Authorized number of shares of common stock   400,000,000   400,000,000    
Aggregate proceeds   $ 67,162 $ 114,180      
Common stock            
Controlled Equity Offering            
Authorized number of shares of common stock         400,000,000 200,000,000
Number of shares of common stock sold (in shares) 18,400,000 18,400,000 45,981,093      
Share price (in dollars per share) $ 3.90