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 6 Months Ended
Jan. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
customer
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
customer
Jun. 30, 2019
USD ($)
Revenue          
Number of customers | customer   2   2  
Revenue   $ 502 $ 157 $ 1,263 $ 157
Revenue recognized in the period   400   1,200  
Increase in deferred revenue $ 46,000     49,074 3,060
Deferred revenue $ 2,100 48,100   48,100  
Development revenue          
Revenue          
Revenue   502 $ 157 1,263 $ 157
Astellas Collaboration Agreement          
Revenue          
Amounts invoiced in the period   $ 50,000   $ 50,000