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INCOME TAXES, STATUTORY INCOME TAX RATES (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax benefits computed using the federal statutory income tax rate      
Statutory rate (34.00%) (34.00%) (34.00%)
State taxes, net of benefit (4.70%) (5.40%) (3.50%)
Permanent differences:      
Derivative losses 2.90% (0.90%) 11.00%
Other 1.10% 0.20% 0.30%
Research and development tax credit (0.20%) (0.50%) (0.40%)
Other 1.40% 0.50% 0.40%
Adoption of ASU 2016-09 7.40%    
Increase / (decrease) in valuation reserve (32.00%) 40.10% 26.20%
Change in federal tax rate 58.10%    
Effective tax rate 0.00% 0.00% 0.00%