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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Stock option activity    
Options outstanding (in shares) 240,695  
Options exercised (in shares) (24,100)  
Options cancelled (in shares) (2,670)  
Options outstanding (in shares) 213,925  
Options vested or expected to vest (in shares) 212,124  
Options exercisable (in shares) 183,065  
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) 6.67  
Options canceled, weighted average exercise price (in dollars per share) 8.92  
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) $ 6.64  
Options outstanding, weighted average remaining contractual term 3 years 9 months 13 days  
Options vested or expected to vest, weighted average remaining contractual term 3 years 9 months 8 days  
Options exercisable, weighted average remaining contractual term 3 years 4 months 18 days  
Options outstanding, aggregate intrinsic value $ 1,531  
Options vested or expected to vest, aggregate intrinsic value 1,520  
Options exercisable, aggregate intrinsic value 1,347  
Intrinsic value of options exercised 126 $ 25
Cash received from options exercised 161 36
Excess tax benefit realized for options exercises $ 8 $ 4