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Income Taxes - Valuation Allowance (Details) - Valuation Allowance, Deferred Tax Asset - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets Valuation Allowance [Roll Forward]    
Balance at Beginning of Year $ 1,240 $ 5,368
Charged to income tax (benefit) expense (22) (103)
Foreign currency 20 (56)
Release valuation allowance 0 (3,969)
Balance at End of Year $ 1,238 $ 1,240