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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net loss $ (2,757,186) $ (7,191,653) $ (22,492,666) $ (19,476,782)
Other comprehensive income (loss)        
Foreign currency translation adjustments (182,933) 206,120 (72,364) (23,928)
Unrealized gains (losses) on marketable securities   (425)   1,356
Other comprehensive income (loss) (182,933) 205,695 (72,364) (22,572)
Comprehensive loss $ (2,940,119) $ (6,985,958) $ (22,565,030) $ (19,499,354)