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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
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) [Abstract]    
Product revenue $ 81 $ 0
Other revenues 300 0
Total revenue 381 0
Costs of goods sold (31) 0
Gross profit 350 0
Operating expenses    
Selling, general and administrative 6,083 7,423
Research and development 4,469 7,131
Total operating expenses 10,552 14,554
Operating loss (10,202) (14,554)
Change in fair value of warrant liability, net (2,272) (338)
Interest income 10 3
Other expense and interest expense (381) 0
Net loss (12,845) (14,889)
Common share data:    
Basic and diluted loss per share (in dollars per share) $ (0.15) $ (0.31)
Weighted average number of basic and diluted common shares outstanding (in shares) 85,487,606 48,341,670
Other comprehensive income (loss):    
Foreign currency translation adjustments 364 0
Comprehensive loss $ (12,481) $ (14,889)