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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Stock option activity    
Options outstanding (in shares) 240,695  
Options exercised (in shares) (32,050)  
Options cancelled (in shares) (3,090)  
Options outstanding (in shares) 205,555  
Options vested or expected to vest (in shares) 204,655  
Options exercisable (in shares) 190,135  
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) 6.50  
Options canceled, weighted average exercise price (in dollars per share) 8.80  
Options Outstanding, weighted average exercise price (in dollars per share) 6.87  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 6.87  
Options exercisable, weighted average exercise price (in dollars per share) $ 6.78  
Options outstanding, weighted average remaining contractual term 3 years 6 months 10 days  
Options vested or expected to vest, weighted average remaining contractual term 3 years 6 months 8 days  
Options exercisable, weighted average remaining contractual term 3 years 4 months  
Options outstanding, aggregate intrinsic value $ 1,847  
Options vested or expected to vest, aggregate intrinsic value 1,840  
Options exercisable, aggregate intrinsic value 1,726  
Intrinsic value of options exercised 197 $ 26
Cash received from options exercised 208 0
Excess tax benefit realized for options exercises $ 19 $ 0