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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (33,459) $ (40,528) $ (115,844) $ (118,930)
Other comprehensive income (loss), net of tax:        
Unrealized (loss) gain on marketable securities available-for-sale (71) (10) 105 (15)
Foreign currency translation adjustments (1,034) (167) (1,178) (791)
Total other comprehensive loss (1,105) (177) (1,073) (806)
Total comprehensive loss $ (34,564) $ (40,705) $ (116,917) $ (119,736)