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Income Taxes - Changes in the Deferred Tax Assets Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at the beginning of the year $ 9,249 $ 7,168 $ 6,940
Charged (Credited) to expenses 1,565 1,577 895
Charged (Credited) to other account (1,091) 504 (667)
Balance at end of year $ 9,723 $ 9,249 $ 7,168