Collaboration, License, and Other Agreements - Sanofi, Immuno-Oncology Narrative (Details) - Sanofi Collaboration Agreement, Immuno-oncology $ in Millions	Jun. 30, 2020 USD ($) shares
Disaggregation of Revenue [Line Items]
Maximum shares the collaborator could sell (in shares) | shares	279,766
Unsatisfied obligation | $	$ 1,020