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Net Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 24 Months Ended 144 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2006
Dec. 31, 2005
Dec. 31, 2004
Dec. 31, 2003
Dec. 31, 2013
Summary of basic and diluted loss per share                        
Net loss $ (6,939) $ (4,320) $ (5,364) $ (8,420) $ (9,138) $ (19,431) $ (13,994) $ (5,241) $ (1,459) $ (511) $ (116) $ (74,933)
Less: Deemed preferred stock dividend (2,026)                     (2,807)
Net loss available to common stockholders $ (8,965) $ (4,320)                   $ (77,985)
Weighted average shares of common stock outstanding 8,631,668 2,226,299                    
Less: Weighted-average shares of unvested common stock (2,188) (2,783)                    
Total weighted-average shares used in computing net loss per share attributed to common stockholders 8,629,480 2,223,516                    
Basic and diluted loss per share $ (1.04) $ (1.94)