Property and Equipment (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Property and Equipment (Textual)
Depreciation expense	$ 1,651,608	$ 1,545,166	$ 3,221,159	$ 3,092,511
Depreciation included in cost of revenues	1,406,935	1,171,242	2,869,272	2,343,975
Non-cancelable capital lease expiration date			Jun. 03, 2014		Jun. 03, 2014
Capital leased assets	807,989		807,989			791,628
Depreciation related to capital lease asset	$ 18,114	$ 0	$ 36,011	$ 0