Annual report pursuant to Section 13 and 15(d)

Subsequent events (Details)

v3.19.3.a.u2
Subsequent events (Details) - Subsequent events. - USD ($)
$ in Millions
Feb. 07, 2020
Jan. 24, 2020
Jan. 13, 2020
American Depository Shares (ADSs)      
Net proceeds $ 89.8    
American Depository Shares (ADSs) | Underwritten Public Offering      
Issuance of common stock (in shares)   21,000,000  
American Depository Shares (ADSs) | Over-Allotment Option      
Issuance of common stock (in shares) 3,150,000    
Astellas Pharma Inc.      
Upfront payment received     $ 50.0
Research funding     $ 7.5