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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (20,318) $ (28,986) $ (45,605) $ (56,009)
Other comprehensive income:        
Unrealized (loss) gain on marketable securities available-for-sale (16) (41) (45) 68
Cumulative foreign currency translation adjustments 1,437 (383) 1,740 303
Total other comprehensive income (loss) 1,421 (424) 1,695 371
Total comprehensive loss $ (18,897) $ (29,410) $ (43,910) $ (55,638)