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STOCKHOLDERS' EQUITY - AT MARKET ISSUANCE SALES AGREEMENT (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 10, 2018
May 18, 2018
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
At Market Issuance Sales Agreements [Line Items]            
Net cash proceeds from issuance of common stock after deducting sales commissions and other offering costs     $ 3,389,000 $ 686,000 $ 101,000  
2018 Sales Agreement            
At Market Issuance Sales Agreements [Line Items]            
Aggregate offering price of common stock $ 62,821,700 $ 100,000,000        
Maximum commission rate (as a percent)   3.00%        
Issuance of common stock in connection with at market offering (in shares)           3,496,616
Net cash proceeds from issuance of common stock after deducting sales commissions and other offering costs           $ 4,075,000
Common stock value available for future issuance     $ 36,500,000     $ 36,500,000