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Components of Income Tax Expense for Continuing Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
Federal | $ (100) | $ 0 | $ 0
State | 830 | 0 | 0
Total income tax expense | $ 730 | $ 0 | $ 0

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