Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		80 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Revenues
Product					$ 224
Collaborations	97	282	214	915	2,110
Grants	38	67	50	162	993
Total Revenues	135	349	264	1,077	3,327
Cost of product revenue					134
Selling, general, and administrative expenses	2,402	2,141	8,807	6,178	21,346
Research and development expenses	2,359	1,130	5,420	2,889	13,502
Loss from Operations	(4,626)	(2,922)	(13,963)	(7,990)	(31,655)
Other Income (Expense)
Fair value of warrant liabilities in excess of proceeds received					(19,019)
Change in fair value of warrant liabilities	(586)	(4,740)	(5,397)	3,575	(27,369)
Financing transaction costs in excess of proceeds received					(2,130)
Loss on inducement to exercise warrants		(1,904)		(1,904)	(1,904)
Gain (loss) on disposal of fixed assets			(4)	(158)	(162)
Interest expense			(13)		(3,484)
Interest income	4	2	11	5	22
Other income (expense)					(30)
Total Other Income (Expense)	(582)	(6,642)	(5,403)	1,518	(54,076)
Net loss	$ (5,208)	$ (9,564)	$ (19,366)	$ (6,472)	$ (85,731)
Net loss per common share-basic and diluted	$ (0.07)	$ (0.20)	$ (0.27)	$ (0.14)
Weighted average shares used in computing net loss per common share-basic and diluted	77,235,976	48,428,186	71,606,724	45,224,906