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Income Taxes - Components of Income Tax Expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
Federal | $ 0 | $ 0 | $ 56,000
State | 0 | 0 | 69,000
Current tax expense | 0 | 0 | 125,000
Deferred: |  |  |
Federal | 28,000 | (350,000) | 380,000
State | 0 | (46,000) | 46,000
Deferred tax benefit | 28,000 | (396,000) | 426,000
Total tax (expense) benefit | $ (28,000) | $ 396,000 | $ (301,000)

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