Quarterly report pursuant to Section 13 or 15(d)

Revenue - Revenue from contracts with customers (Details)

v3.20.2
Revenue - Revenue from contracts with customers (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 13, 2020
USD ($)
Jan. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
customer
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
customer
Sep. 30, 2019
USD ($)
Revenue            
Number of customers | customer     2   2  
Revenue     $ 1,193 $ 237 $ 2,456 $ 394
Revenue recognized in the period     400   1,500  
Increase in deferred revenue   $ 47,700     48,649 2,824
Deferred revenue   $ 2,100 49,800   49,800  
Development revenue            
Revenue            
Revenue     $ 1,193 $ 237 $ 2,456 $ 394
Astellas Collaboration Agreement            
Revenue            
Upfront payment received $ 50,000