Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Warrant (Details)

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STOCKHOLDERS' EQUITY - Warrant (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2017
Mar. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]      
Common stock, par value (in dollars per share)   $ 0.0001 $ 0.0001
Common Stock Warrant      
Class of Warrant or Right [Line Items]      
Common stock, par value (in dollars per share) $ 0.0001    
Exercise price (in dollars per share) $ 3.18    
Term of warrant 3 years    
Aggregate intrinsic value   $ 0  
Weighted average contracted term   2 months 12 days  
Common Stock | Common Stock Warrant      
Class of Warrant or Right [Line Items]      
Common stock warrant purchased (in shares) 2,000,000 2,355,506