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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (22,128) $ (34,694) $ (67,733) $ (90,703)
Other comprehensive income:        
Unrealized gain (loss) on marketable securities available-for-sale 14 (61) (31) 7
Cumulative foreign currency translation adjustments 759 208 2,499 511
Total other comprehensive income 773 147 2,468 518
Total comprehensive loss $ (21,355) $ (34,547) $ (65,265) $ (90,185)