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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTI-DILUTIVE SHARES (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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) 106,492,740 101,548,346 106,492,740 101,548,346