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Net Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Summary of basic and diluted loss per share      
Net loss $ (4,320) $ (5,364)  
Net loss available to common shareholders $ (4,320) $ (5,364) $ (69,020)
Weighted average shares of common stock outstanding 2,226,299 1,675,824  
Less: Weighted-average shares of unvested common stock (2,783) (2,783)  
Total weighted-average shares used in computing net loss per share attributed to common stockholders 2,223,516 1,673,041  
Basic and diluted loss per share $ (1.94) $ (3.21)