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Redeemable Noncontrolling Interest - Summary of Changes in Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Noncontrolling Interest [Abstract]        
Beginning balance     $ 5,909  
Net loss attributable to redeemable noncontrolling interest $ (252) $ (77) (276) $ (161)
Adjustment to the redemption value     266  
Foreign currency translation adjustment     (391)  
Ending balance $ 5,508   $ 5,508