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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTI-DILUTIVE SHARES (Details) - shares
3 Months Ended
Mar. 31, 2018
Mar. 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) 26,245,422 22,844,180