Property and Equipment (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property and Equipment (Textual)
Depreciation expense	$ 2,022,385	$ 2,160,933	$ 6,166,899	$ 6,245,723
Depreciation included in cost of revenues and operating expenses	1,861,821	1,844,902	5,494,243	5,533,436
Depreciation on equipment held for operating lease	$ 0	$ 167,660	$ 0	$ 335,647