CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenues, net	$ 20,142,898	$ 15,026,219	$ 8,775,598
Cost of goods sold	4,506,673	3,671,803	1,959,597
Gross profit	15,636,225	11,354,416	6,816,001
Operating expenses:
Sales, general, and administrative	28,721,236	22,124,072	19,014,837
Research and development	72,042,774	43,218,938	13,551,263
Depreciation and amortization	62,400	52,467	58,145
Total operating expense	100,826,410	65,395,477	32,624,245
Operating loss	(85,190,185)	(54,041,061)	(25,808,244)
Other income (expense):
Miscellaneous income, net	95,719	46,569	34,544
Interest income	17,442	37,309	27,234
Financing costs		(260,027)	(1,503,922)
Interest expense			(1,165,981)
Loan guaranty costs			(2,944)
Total other income (expense)	113,161	(176,149)	(2,611,069)
Loss before income taxes	(85,077,024)	(54,217,210)	(28,419,313)
Net loss	$ (85,077,024)	$ (54,217,210)	$ (28,419,313)
Loss per share, basic and diluted:
Net loss per share, basic and diluted	$ (0.49)	$ (0.36)	$ (0.22)
Weighted average number of common shares outstanding, basic and diluted	173,174,229	149,727,228	127,569,731