Condensed Consolidated Statements of Comprehensive Income/ (Loss) (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income/(loss) attributable to common stockholders	$ 1,680,481	$ (4,465,210)	$ (4,621,397)	$ (6,417,743)
Other comprehensive income/(loss)
Change in foreign currency translation adjustment	(3,006)	(3,398)	(30,485)	(10,586)
Other comprehensive income/(loss)	(3,006)	(3,398)	(30,485)	(10,586)
Comprehensive income/(loss)	$ 1,677,475	$ (4,468,608)	$ (4,651,882)	$ (6,428,329)