Share-Based Compensation - Summary of Options Outstanding (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Number (in shares)	451,530
Weighted Average Remaining Contractual Life	6 years 4 months 13 days
Exercisable, Number (in shares)	237,399
Weighted Average Exercise Price (in usd per share)	$ 13.96
$5.34-$5.39 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in usd per share)	$ 5.34
Range of exercise prices, maximum (in usd per share)	$ 5.39
Outstanding, Number (in shares)	37,500
Weighted Average Remaining Contractual Life	7 years 1 month 28 days
Exercisable, Number (in shares)	25,833
Weighted Average Exercise Price (in usd per share)	$ 5.39
$9.07-$9.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in usd per share)	$ 9.07
Range of exercise prices, maximum (in usd per share)	$ 9.56
Outstanding, Number (in shares)	126,530
Weighted Average Remaining Contractual Life	8 years 7 months 28 days
Exercisable, Number (in shares)	41,066
Weighted Average Exercise Price (in usd per share)	$ 9.19
$11.03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 11.03
Outstanding, Number (in shares)	109,500
Weighted Average Remaining Contractual Life	9 years 7 months 21 days
Exercisable, Number (in shares)	0
Weighted Average Exercise Price (in usd per share)	$ 0.00
$12.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 12.12
Outstanding, Number (in shares)	7,500
Weighted Average Remaining Contractual Life	9 years 9 months 26 days
Exercisable, Number (in shares)	0
Weighted Average Exercise Price (in usd per share)	$ 0.00
$14.47 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 14.47
Outstanding, Number (in shares)	78,000
Weighted Average Remaining Contractual Life	3 years 4 months 6 days
Exercisable, Number (in shares)	78,000
Weighted Average Exercise Price (in usd per share)	$ 14.47
$16.00-$16.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in usd per share)	$ 16.00
Range of exercise prices, maximum (in usd per share)	$ 16.50
Outstanding, Number (in shares)	32,500
Weighted Average Remaining Contractual Life	2 years 2 months 19 days
Exercisable, Number (in shares)	32,500
Weighted Average Exercise Price (in usd per share)	$ 16.04
$19.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 19.10
Outstanding, Number (in shares)	30,000
Weighted Average Remaining Contractual Life	1 year 4 months 2 days
Exercisable, Number (in shares)	30,000
Weighted Average Exercise Price (in usd per share)	$ 19.10
$19.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 19.17
Outstanding, Number (in shares)	30,000
Weighted Average Remaining Contractual Life	4 months 2 days
Exercisable, Number (in shares)	30,000
Weighted Average Exercise Price (in usd per share)	$ 19.17