QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Table Text Block Supplement [Abstract]
License revenue	$ 38,095	$ 38,096	$ 38,095	$ 38,095	$ 38,095	$ 38,096	$ 38,095	$ 38,095
Total costs and expenses	24,066,153	24,963,567	16,061,538	14,030,251	17,678,096	13,863,680	17,149,675	14,640,946	$ 79,121,509	$ 63,332,397	$ 55,873,473
Net loss	$ (23,674,143)	$ (24,831,027)	$ (15,899,062)	$ (13,848,662)	$ (17,611,812)	$ (13,655,916)	$ (17,103,183)	$ (14,577,735)
Basic and diluted net loss per common share	$ (0.48)	$ (0.50)	$ (0.33)	$ (0.28)	$ (0.37)	$ (0.28)	$ (0.38)	$ (0.35)	$ (1.60)	$ (1.38)	$ (1.64)