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Income Taxes - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Operating Loss Carryforwards [Line Items]      
Income tax expense (benefit) allocated to comprehensive income (loss) $ 14 $ 73 $ 37
Tax act provisional tax benefit     $ 3,343
Net tax benefit due to Tax Cuts and Jobs Act of 2017, percent     0.063
Valuation Allowance      
Operating Loss Carryforwards [Line Items]      
Valuation allowance and reserves 1,284 1,452 $ 148
State      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 21,918 21,575  
Tax credit carryforward $ 4,049 $ 4,107