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Stock Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Stock options outstanding, exercisable and expected to vest    
Options outstanding, Number of Shares 1,698,555 1,766,401
Options outstanding, Weighted Average Exercise Price $ 3.71 $ 3.63
Options outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 6 months 22 days  
Outstanding, Aggregate Intrinsic Value $ 1,594  
Options vested and expected to vest, Number of Shares 1,583,062  
Options vested and expected to vest, Weighted Average Exercise Price $ 3.72  
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years) 3 years 4 months 21 days  
Options vested and expected to vest, Aggregate Intrinsic Value 1,514  
Options exercisable, Number of Shares 1,206,552  
Options exercisable, Weighted Average Exercise Price $ 3.76  
Options exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 7 months 2 days  
Options exercisable, Aggregate Intrinsic Value $ 1,292