Property and Equipment (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Property and Equipment (Textual)
Depreciation expense	$ 1,627,258	$ 1,147,409	$ 4,719,769	$ 3,651,168
Depreciation included in inventory and cost of revenues	$ 1,253,362	$ 1,062,878	$ 3,597,337	$ 3,145,842