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Condensed 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 $ (14,883) $ (30,385)
Other comprehensive income (loss):    
Cumulative translation gain   3
Comprehensive loss $ (14,883) $ (30,382)