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Available-for-Sale-Securities - Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Less than one year $ 96,979  
Greater than one year 63  
Cost 97,042 $ 30,750
Estimated Fair Value    
Less than one year 96,914  
Greater than one year 63  
Total estimated fair value $ 96,977 $ 30,737