Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY AND LOSS PER SHARE (Details)

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STOCKHOLDERS' EQUITY AND LOSS PER SHARE (Details) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 11, 2020
Feb. 10, 2020
Feb. 06, 2020
Aug. 09, 2019
Jul. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Aug. 14, 2020
Class of Stock [Line Items]                      
Common stock, shares authorized (in shares)             100,000,000   100,000,000    
New shares issued (in shares)         3,960,560   2,766,798        
Share price (in dollars per share)         $ 2.53            
Net proceeds from units issued in the period $ 28,800,000     $ 3,000,000.0 $ 10,000,000.0 $ 26,460,000   $ 9,940,000      
Gross proceeds from the sale of common stock from private placement offering $ 26,400,000       $ 9,900,000       $ 0 $ 10,020,000  
Shares, outstanding (in shares)       1,193,762              
Gross proceeds from the second closing             $ 7,000,000.0        
Common stock, par value (in dollars per share)             $ 0.001   $ 0.001   $ 0.001
Preferred stock, shares authorized (in shares)             3,000,000   3,000,000    
Loss Per Share                      
Total shares excluded from net loss per share attributable to common stockholders (in shares)                 4,704,695 6,145,052  
Common stock warrants                      
Loss Per Share                      
Total shares excluded from net loss per share attributable to common stockholders (in shares)                 0 2,134,362  
Common stock options                      
Loss Per Share                      
Total shares excluded from net loss per share attributable to common stockholders (in shares)                 1,152,552 1,338,603  
Non-vested restricted stock unit awards                      
Loss Per Share                      
Total shares excluded from net loss per share attributable to common stockholders (in shares)                 3,552,143 2,672,087  
Underwritten Public Offering                      
Class of Stock [Line Items]                      
New shares issued (in shares) 19,166,667   16,666,667                
Share price (in dollars per share)     $ 1.50                
Common stock, par value (in dollars per share)     $ 0.001                
Over-Allotment Option                      
Class of Stock [Line Items]                      
New shares issued (in shares) 2,500,000 2,500,000                  
At-The-Market Equity Offering                      
Class of Stock [Line Items]                      
Sale of stock, authorized amount                     $ 25,000,000.0