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Available-for-Sale-Securities - Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost    
Less than one year $ 17,037  
Greater than one year 0  
Cost 17,037 $ 22,766
Estimated Fair Value    
Less than one year 17,037  
Greater than one year 0  
Total estimated fair value $ 17,037 $ 22,768