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Research collaboration agreement with Allergan (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 24, 2015
USD ($)
Option
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Research collaboration agreement with Allergan          
Research and development   $ 8,365 $ 9,481 $ 19,420 $ 21,971
RCA          
Research collaboration agreement with Allergan          
Agreement term 180 days        
Number of options to acquire molecules | Option 3        
Payment of option exercise fee $ 1,000        
capitalized contract costs   0   0  
Research and development   $ 1,000 $ 1,800 $ 2,600 $ 3,600
Development activities reimbursement percentage   50.00% 50.00% 50.00% 50.00%
Development activities expenses reimbursed   $ 500 $ 900 $ 1,300 $ 1,800