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Consolidated Statements of Comprehensive loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (13,316) $ (1,733)
Other comprehensive income (loss), net of taxes:    
Foreign currency translation (430) 1,703
Net change in market value of investments   (115)
Other comprehensive income (loss) (430) 1,588
Comprehensive loss $ (13,746) $ (145)