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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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