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Income Taxes - Changes in The Valuation Allowance (Details) - Deferred Tax Assets Valuation Allowance [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Income Taxes Changes in Valuation Allowance [Abstract]  
Balance at beginning of year $ 5,495
Charged to costs and expenses $ (5,495) [1]
[1] Of the 2017 amount charged to costs and expenses, $1.8 million primarily relates to the reduction in the tax rate used to compute the valuation allowance as a result of the Tax Cuts and Jobs Act.