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Income Taxes - Schedule of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ 0
State	18	24
Current Income Tax Expense Total	18	24
Deferred:
Federal	(607)	15,171
State	(111)	2,724
Deferred Income Tax Expense Total	(718)	17,895
Valuation allowance	712	(17,881)
Total income tax expense	$ 12	$ 38

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