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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)