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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]        
Net loss $ (16,336,790) $ (4,334,352) $ (25,732,707) $ (14,116,780)
Other comprehensive income (loss)        
Foreign currency translation adjustments 98,706 (133,593) 125,854 66,441
Unrealized gains (losses) on marketable securities 587 (5,413) 3,210 (123,905)
Other comprehensive income (loss) 99,293 (139,006) 129,064 (57,464)
Comprehensive loss $ (16,237,497) $ (4,473,358) $ (25,603,643) $ (14,174,244)