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Research collaboration agreement with Allergan (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jul. 24, 2015
USD ($)
Option
Research collaboration agreement with Allergan      
Research and development $ 11,055 $ 12,490  
RCA      
Research collaboration agreement with Allergan      
Payment of option exercise fee     $ 1,000
Number of options to acquire molecules | Option     3
capitalized contract costs 0    
Research and development $ 1,600 $ 1,800  
Development activities reimbursement percentage 50.00% 50.00%  
Development activities expenses reimbursed $ 800 $ 900