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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 14, 2020
USD ($)
Nov. 30, 2020
USD ($)
$ / shares
shares
Oct. 31, 2020
USD ($)
employe
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
$ / shares
shares
Subsequent Event [Line Items]              
Common stock, issued (in shares) | shares         5,127,525   5,076,593
Common stock, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01
Payment on debt | $         $ 10,000 $ 0  
Oxford Loan              
Subsequent Event [Line Items]              
Payment on debt | $ $ 7,000            
Subsequent Event              
Subsequent Event [Line Items]              
Common stock, issued (in shares) | shares   1,040,000          
Shares issuable per warrants (in shares) | shares   3,109,378          
Warrants to purchase aggregate shares of common stock (in shares) | shares   4,149,378          
Common stock, par value (in dollars per share) | $ / shares   $ 0.001          
Warrant exercise price (in dollars per share) | $ / shares   $ 6.50          
Proceeds from issuance of stock from employee stock purchase plan | $   $ 25,000          
Reduction in force | employe     54        
Headcount reduction     79.00%        
Subsequent Event | Maximum              
Subsequent Event [Line Items]              
Price of each share of common stock and accompanying common warrant (in dollars per share) | $ / shares   $ 6.025          
Subsequent Event | Minimum              
Subsequent Event [Line Items]              
Price of each share of common stock and accompanying common warrant (in dollars per share) | $ / shares   $ 6.024          
Subsequent Event | Oxford Loan              
Subsequent Event [Line Items]              
Payment on debt | $     $ 27,400        
Subsequent Event | Forecast              
Subsequent Event [Line Items]              
Severance costs | $       $ 2,500