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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement Of Comprehensive Income [Abstract]    
Net loss $ (7,620,256) $ (6,416,447)
Other comprehensive income (loss)    
Foreign currency translation adjustments 13,460 (234,104)
Unrealized gains on marketable securities   1,439
Other comprehensive income (loss) 13,460 (232,665)
Comprehensive loss $ (7,606,796) $ (6,649,112)