Intangible assets (Tables)

3 Months Ended

Mar. 31, 2013

Intangible assets [Abstract]

Intangible assets

At March 31, 2013 and December 31, 2012, intangible assets and intangible assets net of amortization were comprised of the following:

	March 31, 2013 (unaudited)			December 31, 2012
Intangible assets	$	25,702,909		$	25,702,909
Accumulated amortization		(5,858,690	)		(5,216,117	)
Intangible assets, net	$	19,844,219		$	20,486,792