CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (11,363,133)	$ (7,078,398)	$ (20,955,594)	$ (13,095,979)
Other comprehensive gain:
Unrealized gain on available-for-sale securities	19,885	0	64,144	0
Comprehensive loss	$ (11,343,248)	$ (7,078,398)	$ (20,891,450)	$ (13,095,979)