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INCOME TAXES - INCOME TAX BENEFITS (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income tax benefits computed using the federal statutory income tax rate      
Statutory rate (34.00%) (34.00%) (34.00%)
State taxes, net of benefit (3.50%) (4.80%) (2.60%)
Permanent differences:      
Derivative losses 11.00% 0.70% 17.10%
Other 0.30% 2.60% 0.00%
R&D tax credit (0.40%) (1.00%) (0.40%)
Other 0.40% 2.20% 0.00%
Increase in valuation reserve 26.20% 34.30% 19.90%
Effective tax rate 0.00% 0.00% 0.00%