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Available-for-Sale-Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Less than one year $ 91,522 $ 30,750
Greater than one year 0 0
Cost 91,522 30,750
Estimated Fair Value    
Less than one year 91,452 30,737
Greater than one year 0 0
Estimated fair value $ 91,452 $ 30,737