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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Parenthetical) (Details) - USD ($)
 12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Incremental income tax expense [1]     $ 2,984,000
Federal statutory rate 21.00% 35.00%  
[1] On December 22, 2017, the United States enacted tax reform legislation commonly known as the Tax Cuts and Jobs Act (the “Tax Act”), resulting in significant modifications to existing law. As a result of the changes under the Tax Act, the Company recorded incremental income tax expense of $2,984,000 during the year ended December 31, 2017, which consisted primarily of the remeasurement of deferred tax assets and liabilities at the new federal statutory rate of 21%. Prior to the enactment of the Tax Act, deferred tax assets and liabilities were measured at the previous federal statutory rate of 35%. Authoritative guidance and interpretation by regulatory bodies is ongoing, and as such, the accounting for the effects of the Tax Act is not final and the full impact of the new regulation is still being evaluated.