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WARRANTS - Issued with Series A Preferred Stock (Details) - 2017 Warrants - Warrants Issued with Series A Preferred Stock
$ / shares in Units, $ in Millions
Jan. 26, 2017
USD ($)
$ / shares
shares
Dec. 31, 2019
Y
Rate
Warrants    
Warrants to purchase common stock (in shares) | shares 309,389  
Warrants to purchase common stock (in dollars) | $ $ 0.2  
Exercise price (in dollars per share) | $ / shares $ 2.49  
Contractual term (in years)    
Warrants    
Measurement input | Y   10.0
Volatility    
Warrants    
Measurement input   0.7448
Risk-free interest rate    
Warrants    
Measurement input   0.0320
Dividend yield    
Warrants    
Measurement input   0.0000