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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement Of Comprehensive Income [Abstract]        
Net loss $ (12,115,224) $ (5,868,682) $ (19,735,480) $ (12,285,129)
Other comprehensive income (loss)        
Foreign currency translation adjustments 97,109 4,054 110,569 (230,048)
Unrealized gains (losses) on marketable securities    342    1,781
Other comprehensive income (loss) 97,109 4,396 110,569 (228,267)
Comprehensive loss $ (12,018,115) $ (5,864,286) $ (19,624,911) $ (12,513,396)