Summary of significant accounting policies - Disaggregation of revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 560,571	$ 478,776	$ 366,388
SaaS subscription and support and maintenance | Recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	521,269	430,613	313,950
On‑premise subscription | Recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	21,750	24,394	30,293
Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	543,019	455,007	344,243
Subscription revenue | Recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	543,019	455,007	344,243
Professional services
Disaggregation of Revenue [Line Items]
Total revenue	16,325	19,025	16,122
Professional services | Non-recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	16,325	19,025	16,122
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenue	1,227	4,744	6,023
Perpetual licenses | Non-recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,227	4,744	6,023
Non‑subscription revenue | Non-recurring Revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 17,552	$ 23,769	$ 22,145
Minimum | Professional services
Disaggregation of Revenue [Line Items]
Service performance period	1 day
Maximum | Professional services
Disaggregation of Revenue [Line Items]
Service performance period	2 days