Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2012	$ 52	$ 155,945	$ (115)	$ (135,938)	$ 19,944	[1]
Balance (in shares) at Dec. 31, 2012	52,425
Exercise of common stock warrants	3	9,806	0	0	9,809
Exercise of common stock warrants (in shares)	3,401.00				3,400,725.00
Exercise of common stock options	1	1,515	0	0	1,516
Exercise of common stock options (in shares)	378				378,366
Employee stock-based compensation expense	0	5,417	0	0	5,417
Consultant stock-based compensation expense	0	3	0	0	3
Reclassification of the fair value of warrant liabilities upon exercise	0	18,091	0	0	18,091
Issuance of common stock under an at-the-market sales agreement, net of commissions and fundraising costs totaling $1,572	5	38,387	0	0	38,392
Issuance of common stock under an at-the-market sales agreement, net of commissions and fundraising costs totaling $1,572 (in shares)	4,939
Foreign currency translation loss	0	0	(78)	0	(78)
Net loss	0	0	0	(57,325)	(57,325)
Balance at Sep. 30, 2013	$ 61	$ 229,164	$ (193)	$ (193,263)	$ 35,769
Balance (in shares) at Sep. 30, 2013	61,143

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2012.