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Investments - Summary of Available-for-Sale Investments at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities    
Cost $ 5,578 $ 2,774
Estimated Fair Value 5,578 2,774
Short-term investments    
Schedule of Available-for-sale Securities    
Cost 5,578 2,774
Estimated Fair Value 5,578 2,774
Short-term investments – commercial paper    
Schedule of Available-for-sale Securities    
Cost 5,578 2,774
Estimated Fair Value $ 5,578 $ 2,774