Property and Equipment (Details Textual) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property and Equipment (Textual)
Depreciation expense	$ 1,661,740	$ 1,627,258	$ 4,882,899	$ 4,719,769
Depreciation included in cost of revenues	$ 1,552,088	$ 1,253,362	$ 4,421,360	$ 3,597,337
Non-cancelable capital lease expiration date			Jun. 03, 2014		Jun. 03, 2014