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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Comprehensive Income [Abstract]        
Net income (loss) $ (5,868,682) $ 833,522 $ (12,285,129) $ (9,395,917)
Other comprehensive income (loss)        
Foreign currency translation adjustments 4,054 (68,738) (230,048) 27,148
Unrealized gains (losses) on marketable securities 342 (130) 1,781 2,623
Other comprehensive income (loss) 4,396 (68,868) 228,267 29,771
Comprehensive income (loss) $ (5,864,286) $ 764,654 $ (12,513,396) $ (9,366,146)