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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income (loss) used for basic calculation $ (3,460) $ 2,260 $ (14,201) $ (9,247)
Effect of revaluation of warrant liability (873) 0 0 0
Adjusted net income (loss) used for diluted calculation $ (4,333) $ 2,260 $ (14,201) $ (9,247)
Denominator:        
Basic weighted average number of common shares outstanding 54,875 47,710 54,130 47,600
Effect of dilutive potential common shares resulting from warrants 502 1,110 0 0
Diluted weighted average number of common shares outstanding 55,377 48,820 54,130 47,600
Net income (loss) per common share:        
Basic $ (0.06) $ 0.05 $ (0.26) $ (0.19)
Diluted $ (0.08) $ 0.05 $ (0.26) $ (0.19)