Property and Equipment (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property and Equipment (Textual)
Depreciation expense	$ 2,160,933	$ 1,661,740	$ 6,245,723	$ 4,882,899
Depreciation included in cost of revenues and operating expenses	1,844,902	1,552,088	5,533,436	4,421,360
Depreciation on equipment held for operating lease	$ 167,660		$ 335,647