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Marketable Securities - Additional Information (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Fair market value of investment securities exceeds cost basis $ 29
Gross unrealized holding gains 30
Gross unrealized holding losses 1
Unrealized gain (loss) on available-for-sale securities (22)
Estimated tax expense (benefit) of change in value of available-for-sale securities (6)
Accrued interest receivable balance $ 107