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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]        
Revenue $ 39 $ 0 $ 146 $ 0
Cost of sales 0 0 0 0
Gross profit 39 0 146 0
Operating expenses        
Selling, general and administrative 6,960 5,744 21,604 15,148
Research and development 5,254 6,437 20,589 15,333
Total operating expenses 12,214 12,181 42,193 30,481
Operating loss (12,175) (12,181) (42,047) (30,481)
Change in fair value of warrant liability, net 446 3,872 1,025 14,864
Interest income 9 1 16 1
Other expense and interest expense (93) 0 (204) 0
Net loss (11,813) (8,308) (41,210) (15,616)
Common share data:        
Basic and diluted loss per share (in dollars per share) $ (0.18) $ (0.18) $ (0.72) $ (0.35)
Weighted average number of basic and diluted common shares outstanding (in shares) 67,219,224 46,961,123 56,844,697 44,315,838
Other comprehensive income (loss) [Abstract]        
Foreign currency translation adjustment 87 0 83 0
Unrealized loss on securities 0 (3) 0 (14)
Other comprehensive income (loss) total 87 (3) 83 (14)
Comprehensive loss $ (11,726) $ (8,311) $ (41,127) $ (15,630)