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Redeemable Noncontrolling Interest - Summary of Changes in Redeemable Noncontrolling Interest (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Noncontrolling Interest [Abstract]  
Balance at December 31, 2017 $ 6,648
Net loss attributable to redeemable noncontrolling interest (84)
Adjustment to the redemption value 38
Foreign currency translation adjustment 348
Balance at March 31, 2018 $ 6,950