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Consolidated Statements of Operations and Comprehensive Loss (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Operations and Comprehensive Loss [Abstract]      
Revenue $ 490 $ 346 $ 0
Other revenues 300 0 0
Total revenue 790 346 0
Costs of goods sold (464) (39) 0
Gross profit 326 307 0
Operating expenses      
Selling, general and administrative 20,657 27,963 21,283
Research and development 12,688 26,215 25,173
Total operating expenses 33,345 54,178 46,456
Operating loss (33,019) (53,871) (46,456)
Change in fair value of warrant liability, net 2,756 2,159 15,566
Interest income 20 19 5
Other expense and interest expense (81) (175) 0
Net Loss (30,324) (51,868) (30,885)
Common share data:      
Basic loss per share (in dollars per share) $ (0.30) $ (0.85) $ (0.68)
Diluted loss per share (in dollars per share) $ (0.31) $ (0.85) $ (0.68)
Weighted average number of basic common shares outstanding (in shares) 100,809,824 61,275,527 45,236,921
Weighted average number of diluted common shares outstanding (in shares) 105,104,177 61,275,527 45,236,921
Other comprehensive income (loss):      
Foreign currency translation adjustments 59 37 0
Unrealized loss on securities 0 0 26
Other comprehensive income, total 59 37 26
Comprehensive loss $ (30,265) $ (51,831) $ (30,859)