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Equity Method Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 01, 2019
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Equity method investment   $ 4,677 $ 4,677   $ 4,892 [1]
Share of losses from equity method investments     $ 215 $ 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% 25.00%    
Equity method investment $ 5,000 $ 4,700 $ 4,700   $ 4,900
Share of losses from equity method investments   $ 100 $ 200    
[1] The balance sheet as of December 31, 2019 is derived from the audited financial statements as of that date.