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Available-for-Sale-Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Less than one year $ 30,750 $ 22,766
Greater than one year 0 0
Cost 30,750 22,766
Estimated Fair Value    
Less than one year 30,737 22,768
Greater than one year 0 0
Estimated fair value $ 30,737 $ 22,768