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	52,425,000
Exercise of common stock warrants	2	6,704	0	0	6,706
Exercise of common stock warrants (in shares)	2,333,000
Exercise of common stock options	0	7	0	0	7
Exercise of common stock options (in shares)	8,000
Employee stock-based compensation expense	0	3,594	0	0	3,594
Consultant stock-based compensation expense	0	3	0	0	3
Reclassification of the fair value of warrant liabilities upon exercise	0	8,918	0	0	8,918
Issuance of common stock under an at-the-market sales agreement, net of commissions and fundraising costs totaling $894	4	22,363	0	0	22,367
Issuance of common stock under an at-the-market sales agreement, net of commissions and fundraising costs totaling $894 (in shares)	3,548,000
Foreign currency translation loss	0	0	(89)	0	(89)
Net loss	0	0	0	(40,048)	(40,048)
Balance at Jun. 30, 2013	$ 58	$ 197,534	$ (204)	$ (175,986)	$ 21,402
Balance (in shares) at Jun. 30, 2013	58,314,000

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