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Equity Method Investment (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]        
Equity method investment   $ 4,829   $ 4,892 [1]
Share of losses from equity method investments   64 $ 0  
Notch Therapeutics, Inc.        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire interest in Notch $ 5,100      
Transaction cost   $ 100    
Ownership percentage 25.00% 25.00%    
Equity method investment $ 5,000     $ 4,900
Share of losses from equity method investments   $ 100    
[1] The balance sheet as of December 31, 2019 is derived from the audited financial statements as of that date.