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Available-for-Sale-Securities - Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amortized Cost    
Less than one year $ 32,621  
Greater than one year 0  
Cost 32,621 $ 22,766
Estimated Fair Value    
Less than one year 32,614  
Greater than one year 0  
Total estimated fair value $ 32,614 $ 22,768