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Marketable Securities and Fair Value Measurements - Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost    
Less than 1 year $ 34,906  
Mature in 1 - 3 years 42,403  
Amortized Cost 77,309 $ 83,929
Fair Value    
Less than 1 year 34,902  
Mature in 1 - 3 years 42,371  
Fair Value $ 77,273 $ 84,180