Quarterly report pursuant to Section 13 or 15(d)

Revenue - Collaboration Agreement (Details)

v3.20.1
Revenue - Collaboration Agreement (Details) - Astellas Collaboration Agreement
$ in Millions
3 Months Ended
Jan. 13, 2020
USD ($)
item
Mar. 31, 2020
USD ($)
item
Collaboration and License Agreement    
Number of co-development targets | item 3 3
Number of independent targets | item 2 2
Amount of transaction price of the agreement at inception $ 50.0  
Amount of standalone selling price allocated from upfront research payment   $ 7.0
Amount of standalone selling price for the rights granted for independent targets   $ 14.5