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Available-for-Sale-Securities - Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Less than one year $ 86,615  
Greater than one year  
Cost 86,615 $ 91,522
Estimated Fair Value    
Less than one year 86,419  
Greater than one year 0  
Total estimated fair value $ 86,419 $ 91,452