Statements Of Comprehensive Loss (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statements Of Comprehensive Loss [Abstract]
Revenue	$ 0	$ 0	$ 0
Cost of sales	0	0	0
Gross margin	0	0	0
Research and development expenses	10,406,362	8,447,639	8,423,683
Marketing and selling expenses	1,755,130	1,638,156	1,449,501
General and administrative expenses	15,787,599	10,297,238	4,802,503
Total operating expenses	27,949,091	20,383,033	14,675,687
Interest and other income	83,892	70,064	108,050
Interest expense	(7,094)	(8,843)	(5,716)
Total interest and other income and interest expense	76,798	61,221	102,334
Net loss	(27,872,293)	(20,321,812)	(14,573,353)
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on available for sale securities	(8,195)	10,398	(2,602)
Other comprehensive income (loss), net of tax	(8,195)	10,398	(2,602)
Comprehensive loss	$ (27,880,488)	$ (20,311,414)	$ (14,575,955)
Basic and diluted net loss per common share	$ (0.31)	$ (0.27)	$ (0.24)