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Income Taxes - Operating Loss Carryforward (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Loss Carryforward  
Alternative minimum tax credit carryforward $ 43
Federal | IRS  
Operating Loss Carryforward  
Net operating loss carryforward 3,096
Net operating loss carryforward, annual limit 1,877
State | California  
Operating Loss Carryforward  
Net operating loss carryforward $ 4,707