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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Fair Value Disclosures [Abstract]        
Beginning balance $ 108   $ 3,662 $ 4,288
Cash contributions 2,869      
Unrealized loss (1,008) $ 108 $ (3,662) (626)
Ending balance $ 1,969 $ 108   $ 3,662