DERIVATIVE FINANCIAL INSTRUMENTS - Derivative Warrant Issuances (Details) - Warrants - Derivative - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding, Beginning Balance (in shares)	3,421,355	4,782,249
Issuance of common shares under the equity incentive plan	125,000	637,500
Canceled (in shares)	0	0
Exercised (in shares)	880,807	1,998,394
Outstanding, Ending Balance (in shares)	2,665,548	3,421,355
Weighted Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)	$ 6.43	$ 5.04
Issued (in dollars per share)	13.25	11.44
Cancelled (in dollars per share)	0.00	0.00
Exercised (in dollars per share)	5.35	4.70
Outstanding, Ending Balance (in dollars per share)	7.05	6.43
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance (in dollars per share)	3.79	3.13
Issued (in dollars per share)	8.40	6.49
Cancelled (in dollars per share)	0.00	0.00
Exercised (in dollars per share)	3.23	3.05
Outstanding, Ending Balance (in dollars per share)	$ 4.20	$ 3.79