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Investments - Schedule of Available-for-Sale Investment Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due in less than 1 year $ 51,968 $ 43,627
Due in 1-3 years 247 3,788
Amortized Cost 52,215 47,415
Fair Value    
Due in less than 1 year 52,213 43,650
Due in 1-3 years 247 3,787
Fair Value $ 52,460 $ 47,437