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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock option activity      
Options outstanding (in shares) 202,215 240,695 368,360
Options assumed in acquisition (in shares) 313,360    
Options exercised (in shares) (281,125) (35,280) (9,070)
Options forfeited (in shares) (1,580) (3,200) (118,595)
Options outstanding (in shares) 232,870 202,215 240,695
Stock option activity, weighted average exercise price      
Options Outstanding, weighted average exercise price (in dollars per share) $ 6.87 $ 6.83 $ 8.89
Options assumed in acquisition (in dollars per share) 11.79    
Options exercised, weighted average exercise price (in dollars per share) 10.47 6.55 6.64
Options canceled, weighted average exercise price (in dollars per share) 8.11 8.77 13.25
Options Outstanding, weighted average exercise price (in dollars per share) $ 9.13 $ 6.87 $ 6.83
Options vested or expected to vest (in shares) 232,870    
Options exercisable (in shares) 232,870    
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 9.13    
Options exercisable, weighted average exercise price (in dollars per share) $ 9.13    
Options outstanding, weighted average remaining contractual term 2 years 10 months 12 days 3 years 3 months 5 days 4 years 22 days
Options vested or expected to vest, weighted average remaining contractual term 2 years 10 months 12 days    
Options exercisable, weighted average remaining contractual term 2 years 10 months 12 days    
Options outstanding, aggregate intrinsic value $ 2,574 $ 2,647 $ 1,251
Options vested or expected to vest, aggregate intrinsic value 2,574    
Options exercisable, aggregate intrinsic value $ 2,574