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Equity Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Cash investments $ 2,869    
Equity investments 15,156   $ 15,366
Carrying value of non-marketable equity securities 930   $ 930
Nimbus Therapeutics, LLC      
Schedule of Equity Method Investments [Line Items]      
Cash investments $ 2,869    
Percentage of equity investment held on fully diluted basis 7.60%   6.70%
Equity investments losses $ 1,008 $ 626  
Equity investments 1,969   $ 108
Morphic Holding, Inc.      
Schedule of Equity Method Investments [Line Items]      
Equity investments losses 2,071 $ 0  
Equity investments $ 12,257   $ 14,328