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Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 24 Months Ended 135 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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
Mar. 31, 2013
Summary of basic and diluted loss per share                          
Net loss $ (1,071) $ (1,407) $ (4,320) $ (5,364) $ (8,420) $ (9,138) $ (19,431) $ (13,994) $ (5,241) $ (1,459) $ (511) $ (116) $ (69,065)
Net loss attributable to common stockholders $ (1,071) $ (1,407)                     $ (70,091)
Weighted average shares of common stock outstanding 3,037,546 2,030,499                      
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 3,034,763 2,027,716                      
Basic and diluted loss per share $ (0.35) $ (0.69)