Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Valuation Allowance (Details)

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Income Taxes - Summary of Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]    
Valuation Allowance at Beginning of Period $ 1,397 $ 155
Income Tax Benefit 1,164 1,242
Release of Valuation Allowance 0 0
Valuation Allowance at End of Period $ 2,561 $ 1,397