Share-Based Compensation - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of shares vested and exercisable	410,236	448,371	668,130
Options vested and exercisable weighted average remaining contractual life	5 years 5 months	5 years 27 days	4 years 7 months 20 days
Options vested and exercisable weighted average exercise price	$ 10.57	$ 7.54	$ 6.36
Options vested and exercisable intrinsic value	$ 9,224	$ 7,029	$ 10,731
4.54-20.92
Range of exercise prices, lower range	$ 4.54
Range of exercise prices, upper range	$ 20.92
Number of shares vested and exercisable	338,308
Options vested and exercisable weighted average remaining contractual life	4 years 9 months
Options vested and exercisable weighted average exercise price	$ 8.03
Options vested and exercisable intrinsic value	$ 8,465
20.96-26.50
Range of exercise prices, lower range	$ 20.96
Range of exercise prices, upper range	$ 26.50
Number of shares vested and exercisable	71,928
Options vested and exercisable weighted average remaining contractual life	8 years 6 months 22 days
Options vested and exercisable weighted average exercise price	$ 22.50
Options vested and exercisable intrinsic value	$ 759
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 20 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
3.21-6.89
Range of exercise prices, lower range			$ 3.21
Range of exercise prices, upper range			$ 6.89
Number of shares vested and exercisable			411,553
Options vested and exercisable weighted average remaining contractual life			3 years 5 months 15 days
Options vested and exercisable weighted average exercise price			$ 5.16
Options vested and exercisable intrinsic value			$ 7,113
7.13-8.17
Range of exercise prices, lower range			$ 7.13
Range of exercise prices, upper range			$ 8.17
Number of shares vested and exercisable			81,050
Options vested and exercisable weighted average remaining contractual life			6 years 6 months 15 days
Options vested and exercisable weighted average exercise price			$ 7.27
Options vested and exercisable intrinsic value			$ 1,226
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