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STOCKHOLDERS' EQUITY - SALES AGREEMENTS (Details) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
May 18, 2018
Aug. 28, 2015
Dec. 31, 2017
Jul. 31, 2018
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
At Market Issuance Sales Agreements [Line Items]              
Net cash proceeds from issuance of common stock after deducting sales commissions and offering costs           $ 86,017,000 $ 1,060,000
2015 Sales Agreement              
At Market Issuance Sales Agreements [Line Items]              
Aggregate offering price of common stock   $ 50,000,000          
Maximum commission rate (as a percent)   3.00%          
Issuance of common stock in connection with at market offering (in shares)     614,230   13,195,106    
Net cash proceeds from issuance of common stock after deducting sales commissions and offering costs     $ 1,060,000   $ 47,651,000    
2018 Sales Agreement              
At Market Issuance Sales Agreements [Line Items]              
Aggregate offering price of common stock $ 100,000,000            
Maximum commission rate (as a percent) 3.00%            
Issuance of common stock in connection with at market offering (in shares)       10,083,079      
Net cash proceeds from issuance of common stock after deducting sales commissions and offering costs       $ 38,366,000