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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net loss used for basic calculation $ (1,907) $ (6,409) $ (10,741) $ (11,507)
Effect of revaluation of warrant liability (3,674) 0 0 0
Adjusted net loss used for diluted calculation $ (5,581) $ (6,409) $ (10,741) $ (11,507)
Denominator:        
Basic weighted average number of common shares outstanding 54,418 47,620 53,753 47,530
Effect of dilutive potential common shares resulting from warrants 818 0 0 0
Diluted weighted average number of common shares outstanding 55,236 47,620 53,753 47,530
Net loss per common share:        
Basic $ (0.04) $ (0.13) $ (0.20) $ (0.24)
Diluted $ (0.10) $ (0.13) $ (0.20) $ (0.24)