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Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Tax benefit $ 0 $ 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Net deferred tax assets as of January 1 0 0
Additions related to prior period tax positions 3,345 0
Additions related to current period tax positions 742 0
Net deferred tax assets as of December 31 $ 4,087 $ 0