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Share-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Stock option activity  
Options outstanding (in shares) | shares 240,695
Options exercised (in shares) | shares (35,280)
Options forfeited (in shares) | shares (3,200)
Options outstanding (in shares) | shares 202,215
Stock option activity, weighted average exercise price  
Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.83
Options exercised, weighted average exercise price (in dollars per share) | $ / shares 6.55
Options canceled, weighted average exercise price (in dollars per share) | $ / shares 8.77
Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.87
Options vested or expected to vest (in shares) | shares 201,347
Options exercisable (in shares) | shares 187,105
Options vested or expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 6.87
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 6.78
Options outstanding, weighted average remaining contractual term 3 years 3 months 4 days
Options vested or expected to vest, weighted average remaining contractual term 3 years 3 months 1 day
Options exercisable, weighted average remaining contractual term 2 years 12 months 23 days
Options outstanding, aggregate intrinsic value | $ $ 2,647
Options vested or expected to vest, aggregate intrinsic value | $ 2,636
Options exercisable, aggregate intrinsic value | $ $ 2,466