STOCK PURCHASE WARRANTS (Details) - August 2013 warrants - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2014	Dec. 31, 2015
Stock Purchase Warrants
Exercise price per share (in dollars per share)	$ 4.80
Total shares issuable on exercise	724,950
Assumptions used in calculating the estimated fair value of the warrants
Closing stock price (in dollars per share)	$ 2.25		$ 2.58
Expected dividend rate (as a percent)	0.00%	0.00%
Expected stock price volatility (as a percent)	85.90%	91.40%
Risk-free interest rate (as a percent)	0.60%	1.30%
Expected life (in years)	2 years 1 month 17 days	2 years 7 months 17 days