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, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Valuation allowance at beginning of period $ 2,561 $ 1,397
Income tax benefit 3,294 1,164
Release of valuation allowance 0 0
Valuation allowance at end of period $ 5,855 $ 2,561