Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Net loss	$ (41,089)	$ (5,112)
Depreciation and amortization	235	233
Amortization of discount and deferred financing costs on notes payable	63
Stock-based compensation expense	741	611
Change in fair value of warrant liability	29,481	(4,987)
Recognition of deferred revenue	(145)	(13)
Extinguishment of debt	(199)	35
Net change in assets and liabilities:
Government grant receivable	489
Prepaid expenses	17	(220)
Other current assets	(27)	(21)
Other long term assets	116	64
Accounts payable	15	(610)
Accrued liabilities	569	11
Accrued compensation and related liabilities	(103)	(308)
Deferred rent	24	47
Net cash used in operating activities	(9,813)	(10,270)
Purchase of short-term investments	(11,858)	(12,157)
Redemption of short-term investments	19,335	6,122
Purchase of plant and equipment	(65)	(155)
Net cash provided by (used in) investing activities	7,412	(6,190)
Proceeds from issuance of common stock, net of issuance cost	43,071
Proceeds from stock options exercised	48
Proceeds from debt financing, net of issuance cost	4,804
Net cash provided by financing activities	47,923
Increase (decrease) in cash and cash equivalents	45,522	(16,460)
Cash and cash equivalents, beginning of period	5,514	18,974
Cash and cash equivalents, end of period	$ 51,036	$ 2,514