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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of diluted loss per share (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from calculation 13,126,038 11,103,701
Unvested restricted stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from calculation 10,492,731 8,409,696
Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from calculation 2,467,537 2,529,133
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from calculation 147,058 147,058
Share Issuable Upon Note Conversion [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from calculation 18,712 17,814