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Share-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Stock option activity  
Options outstanding (in shares) | shares 368,360
Options exercised (in shares) | shares (9,070)
Options forfeited (in shares) | shares (118,595)
Options outstanding (in shares) | shares 240,695
Stock option activity, weighted average exercise price  
Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 8.89
Options exercised, weighted average exercise price (in dollars per share) | $ / shares 6.64
Options canceled, weighted average exercise price (in dollars per share) | $ / shares 13.25
Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.83
Options vested or expected to vest (in shares) | shares 238,746
Options exercisable (in shares) | shares 208,375
Options vested or expected to vest, weighted average exercise price (in dollars per share) | $ / shares $ 6.82
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 6.65
Options outstanding, weighted average remaining contractual term 4 years 22 days
Options vested or expected to vest, weighted average remaining contractual term 4 years 16 days
Options exercisable, weighted average remaining contractual term 3 years 7 months 23 days
Options outstanding, aggregate intrinsic value | $ $ 1,251
Options vested or expected to vest, aggregate intrinsic value | $ 1,243
Options exercisable, aggregate intrinsic value | $ $ 1,122