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Stock-Based Compensation - Schedule by Exercise Price Range (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares 1,179,199
Weighted Average Remaining Contractual Life 7 years 1 month 17 days
Weighted Average Exercise Price (usd per share) $ 2.66
$0.00 – $3.00
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares 1,128,949
Weighted Average Remaining Contractual Life 2 years 5 months 26 days
Weighted Average Exercise Price (usd per share) $ 7.20
Range of Exercise Price, Lower Limit (usd per share) $ 0.00
Range of Exercise Price, Upper Limit (usd per share) $ 3.00
$3.01 - $9.99
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares 50,250
Weighted Average Remaining Contractual Life 6 years 7 months 27 days
Weighted Average Exercise Price (usd per share) $ 5.52
Range of Exercise Price, Lower Limit (usd per share) $ 3.01
Range of Exercise Price, Upper Limit (usd per share) $ 9.99