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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Tax reconciliation disclosures    
Loss before income taxes $ (18,340) $ (16,057)
Income tax expense (benefit) 190 (230)
Domestic    
Tax reconciliation disclosures    
Income tax expense (benefit) 100 100
Foreign tax    
Tax reconciliation disclosures    
Income tax expense (benefit) $ 100 $ (300)