XML 25 R17.htm IDEA: XBRL DOCUMENT v3.22.1
Summary of significant accounting policies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Lessee, Lease, Description [Line Items]      
Expected dividends 0.00% 0.00%  
Prefunded Warrants      
Lessee, Lease, Description [Line Items]      
Outstanding pre-funded warrants (in shares) 12,663,010 12,663,010  
Money market funds      
Lessee, Lease, Description [Line Items]      
Money market funds $ 126.9   $ 140.9
Maximum | Office space      
Lessee, Lease, Description [Line Items]      
Lease term 12 months