Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes
Provisions for income taxes	$ 1,400,406	$ 160,143	$ 3,193,519	$ 1,067,242
Effective tax rate (as a percent)	42.90%	40.30%	38.40%	37.50%