CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement Of Other Comprehensive Income [Abstract]
Net Loss	$ (31,862,454)	$ (27,453,954)	$ (46,958,921)
Other comprehensive (loss) income:
Foreign currency translation gain (loss)	75,668	(55,626)	276,959
Unrealized gain (loss) on available-for-sale securities, net		18,502	(114,300)
Comprehensive Loss	$ (31,786,786)	$ (27,491,078)	$ (46,796,262)