Stock-based Compensation (Schedule of Stock Option Activity) (Details) - Employee Stock Option [Member] - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding, beginning balance	693,100
Granted	58,000
Exercised	(101,100)
Forfeited	(78,400)
Outstanding, ending balance	571,600
Vested and expected to vest, end of period	496,428
Exercisable, end of period	164,167	118,161
Weighted Average Exercise Price
Outstanding, beginning balance	$ 9.08
Granted	14.74
Exercised	6.62
Forfeited	11.88
Outstanding, ending balance	9.71
Vested and expected to vest, end of period	9.60
Exercisable, end of period	$ 6.95	$ 4.75
Weighted Average Remaining Contractual Life
Outstanding, ending balance	7 years 9 months
Vested and expected to vest, end of period	7 years 8 months 8 days
Exercisable, end of period	6 years 3 months 7 days
Aggregate Intrinsic Value
Outstanding, ending balance	$ 3,154,415
Vested and expected to vest, end of period	2,796,239
Exercisable, end of period	$ 1,356,896