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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Stock option activity    
Options outstanding (in shares)   511,019
Options granted (in shares) 91,150 91,150
Options exercised (in shares)   (65,450)
Options cancelled (in shares)   (29,640)
Options outstanding (in shares) 507,079 507,079
Options vested or expected to vest (in shares) 487,751 487,751
Options exercisable (in shares) 360,079 360,079
Options outstanding, weighted average remaining contractual term   4 years 10 months 13 days
Options vested or expected to vest, weighted average remaining contractual term   4 years 6 months 22 days
Options exercisable, weighted average remaining contractual term   3 years 1 month 24 days
Options outstanding, aggregate intrinsic value $ 373 $ 373
Options vested or expected to vest, aggregate intrinsic value 350 350
Options exercisable, aggregate intrinsic value $ 232 $ 232
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share)   $ 8.56
Options granted, weighted average grant date fair value of options granted in period (in dollars per share)   $ 8.02
Options exercised, weighted average exercise price (in dollars per share)   $ 5.52
Options canceled, weighted average exercise price (in dollars per share)   $ 10.12
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.76 $ 8.76
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.84 $ 8.84
Options exercisable, weighted average exercise price (in dollars per share) $ 9.41 $ 9.41