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Summary of significant accounting policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenue $ 124,557 $ 95,621 $ 348,453 $ 262,586
Subscription        
Disaggregation of Revenue [Line Items]        
Total revenue 118,524 90,700 330,132 245,900
Subscription | Subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 118,524 90,700 330,132 245,900
SaaS subscription and support and maintenance | Subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 112,351 83,775 312,992 222,672
On‑premise subscription | Subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 6,173 6,925 17,140 23,228
Non‑subscription revenue | Non‑subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 6,033 4,921 18,321 16,686
Professional services        
Disaggregation of Revenue [Line Items]        
Total revenue 5,216 4,083 14,187 12,015
Professional services | Non‑subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 5,216 4,083 14,187 12,015
Perpetual licenses        
Disaggregation of Revenue [Line Items]        
Total revenue 817 838 4,134 4,671
Perpetual licenses | Non‑subscription revenue        
Disaggregation of Revenue [Line Items]        
Total revenue $ 817 $ 838 $ 4,134 $ 4,671