Commitments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments
Rental expense	$ 79,913	$ 56,716	$ 199,915	$ 140,744
Future minimum payments for operating leases
Remainder of 2013	132,000		132,000
2014	92,850		92,850
2015	64,941		64,941
2016	7,274		7,274
Total	297,065		297,065
Future minimum payments for other commitments
Remainder of 2013	2,644,256		2,644,256
2014	5,157,122		5,157,122
2015	1,668,067		1,668,067
2016	679,433		679,433
Total	10,148,878		10,148,878
Future minimum payments for operating leases and other commitments
Remainder of 2013	2,776,256		2,776,256
2014	5,249,972		5,249,972
2015	1,733,008		1,733,008
2016	686,707		686,707
Total	$ 10,445,943		$ 10,445,943