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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (23,591) $ (24,777) $ (49,808) $ (38,617)
Other comprehensive income (loss):        
Unrealized (loss) gain on marketable securities available-for-sale (9) 1 (1) 70
Cumulative foreign currency translation adjustments 237 (97) (1,057) (106)
Total other comprehensive income (loss) 228 (96) (1,058) (36)
Total comprehensive loss $ (23,363) $ (24,873) $ (50,866) $ (38,653)