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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stock option activity    
Options outstanding (in shares) 368,360  
Options exercised (in shares) (5,760)  
Options cancelled (in shares) (118,195)  
Options outstanding (in shares) 244,405  
Options vested or expected to vest (in shares) 242,453  
Options exercisable (in shares) 211,885  
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.89  
Options exercised, weighted average exercise price (in dollars per share) 6.62  
Options canceled, weighted average exercise price (in dollars per share) 13.27  
Options Outstanding, weighted average exercise price (in dollars per share) 6.83  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 6.82  
Options exercisable, weighted average exercise price (in dollars per share) $ 6.65  
Options outstanding, weighted average remaining contractual term 4 years 3 months 21 days  
Options vested or expected to vest, weighted average remaining contractual term 4 years 3 months 15 days  
Options exercisable, weighted average remaining contractual term 3 years 10 months 27 days  
Options outstanding, aggregate intrinsic value $ 1,288  
Options vested or expected to vest, aggregate intrinsic value 1,280  
Options exercisable, aggregate intrinsic value 1,155  
Intrinsic value of options exercised 26 $ 39
Cash received from options exercised 38 45
Excess tax benefit realized for options exercises $ 4 $ 6