Share-Based Compensation - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of shares vested and exercisable	448,371	668,130	583,115
Options vested and exercisable weighted average remaining contractual life	5 years 25 days	4 years 7 months 19 days	5 years 2 months 1 day
Options vested and exercisable weighted average exercise price	$ 7.54	$ 6.36	$ 5.75
Options vested and exercisable intrinsic value	$ 7,029	$ 10,731	$ 9,068
$4.31 - 8.65
Range of exercise prices, lower range	$ 4.31
Range of exercise prices, upper range	$ 8.65
Number of shares vested and exercisable	421,237
Options vested and exercisable weighted average remaining contractual life	4 years 10 months 22 days
Options vested and exercisable weighted average exercise price	$ 7.04
Options vested and exercisable intrinsic value	$ 6,814
$8.70 - 22.76
Range of exercise prices, lower range	$ 8.70
Range of exercise prices, upper range	$ 22.76
Number of shares vested and exercisable	27,134
Options vested and exercisable weighted average remaining contractual life	7 years 9 months 25 days
Options vested and exercisable weighted average exercise price	$ 15.31
Options vested and exercisable intrinsic value	$ 215
$23.57 - 23.57
Range of exercise prices, lower range	$ 23.57
Range of exercise prices, upper range	$ 23.57
Number of shares vested and exercisable	0
Options vested and exercisable weighted average remaining contractual life	0 days
Options vested and exercisable weighted average exercise price	$ 0.00
Options vested and exercisable intrinsic value	$ 0
$3.21 - 6.89
Range of exercise prices, lower range		$ 3.21	$ 3.21
Range of exercise prices, upper range		$ 6.89	$ 6.89
Number of shares vested and exercisable		411,553	422,003
Options vested and exercisable weighted average remaining contractual life		3 years 5 months 15 days	4 years 1 month 2 days
Options vested and exercisable weighted average exercise price		$ 5.16	$ 4.85
Options vested and exercisable intrinsic value		$ 7,113	$ 6,941
$7.13 - 8.17
Range of exercise prices, lower range		$ 7.13	$ 7.13
Range of exercise prices, upper range		$ 8.17	$ 8.17
Number of shares vested and exercisable		81,050	63,225
Options vested and exercisable weighted average remaining contractual life		6 years 6 months 14 days	7 years 5 months 12 days
Options vested and exercisable weighted average exercise price		$ 7.27	$ 7.24
Options vested and exercisable intrinsic value		$ 1,226	$ 889
$8.65 - 21.14
Range of exercise prices, lower range		$ 8.65
Range of exercise prices, upper range		$ 21.14
Number of shares vested and exercisable		175,527
Options vested and exercisable weighted average remaining contractual life		6 years 6 months 12 days
Options vested and exercisable weighted average exercise price		$ 8.76
Options vested and exercisable intrinsic value		$ 2,392
$8.65 - 9.34
Range of exercise prices, lower range			$ 8.65
Range of exercise prices, upper range			$ 9.34
Number of shares vested and exercisable			97,887
Options vested and exercisable weighted average remaining contractual life			8 years 4 months 17 days
Options vested and exercisable weighted average exercise price			$ 8.65
Options vested and exercisable intrinsic value			$ 1,238