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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTI-DILUTIVE SHARES (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock options and warrants excluded from diluted net loss per share calculation due to net loss position      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Potential dilutive securities excluded from diluted earnings (loss) per share calculation (in shares) 38,151,906 27,823,845 22,946,422