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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock option activity    
Options outstanding (in shares) 240,695  
Options exercised (in shares) (21,590)  
Options cancelled (in shares) (1,260)  
Options outstanding (in shares) 217,845  
Options vested or expected to vest (in shares) 216,023  
Options exercisable (in shares) 186,785  
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share) $ 6.83  
Options exercised, weighted average exercise price (in dollars per share) 6.64  
Options canceled, weighted average exercise price (in dollars per share) 8.02  
Options Outstanding, weighted average exercise price (in dollars per share) 6.84  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 6.83  
Options exercisable, weighted average exercise price (in dollars per share) $ 6.65  
Options outstanding, weighted average remaining contractual term 3 years 12 months 18 days  
Options vested or expected to vest, weighted average remaining contractual term 3 years 12 months 10 days  
Options exercisable, weighted average remaining contractual term 3 years 7 months 19 days  
Options outstanding, aggregate intrinsic value $ 934  
Options vested or expected to vest, aggregate intrinsic value 928  
Options exercisable, aggregate intrinsic value 838  
Intrinsic value of options exercised 114 $ 0
Cash received from options exercised 143 0
Excess tax benefit realized for options exercises $ 5 $ 0