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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Comprehensive Loss [Abstract]      
Net loss $ (4,920,115) $ (3,797,573) $ (34,849,277)
Other comprehensive (loss) income:      
Realization of cumulative translation adjustment included in net loss (1,227,656)      
Foreign currency translation adjustments (194) (239,975) 68,824
Net unrealized losses on investments       (6,483)
Comprehensive loss $ (6,147,965) $ (4,037,548) $ (34,786,936)