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Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 129 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Summary of basic and diluted loss per share          
Net Loss $ (927) $ (1,822) $ (3,480) $ (3,734)  
Net Loss attributable to common shareholders $ (927) $ (1,822) $ (3,480) $ (3,734) $ (68,180)
Weighted average shares of common stock outstanding 13,719,116 10,516,170 12,698,775 9,838,404  
Less: Weighted-average shares of unvested common stock (16,698) (16,698) (16,698) (16,698)  
Total weighted-average shares used in computing net loss per share attributed to common stockholders 13,702,418 10,499,472 12,682,077 9,821,706  
Basic Loss per share $ (0.07) $ (0.17) $ (0.27) $ (0.38)