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License and Research Collaboration Agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2015
Dec. 31, 2014
Mar. 31, 2020
Mar. 18, 2020
Feb. 04, 2020
Merck | License and collaboration revenue          
Deferred Revenue Arrangement [Line Items]          
Grant revenue     $ 21    
License and Collaborative Arrangement | Merck          
Deferred Revenue Arrangement [Line Items]          
Upfront cash payments $ 20,000 $ 30,000      
License and Collaborative Arrangement | Merck, Sharpe and Dohme Corp          
Deferred Revenue Arrangement [Line Items]          
Value of PRV company is entitled to       60.00% 60.00%