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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits-beginning of period $ 168 $ 0  
Additions for tax positions related to prior year 0 168  
Reductions for tax positions related to prior year 0 0  
Foreign currency adjustments 23 0  
Additions for tax positions related to current year 0 0  
Unrecognized tax benefits-end of period 191 168  
Interest and penalties $ 0 $ 0 $ 0