Summary of significant accounting policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 115,638	$ 86,238	$ 223,896	$ 166,965
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	109,407	80,718	211,608	155,200
Subscription | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	109,407	80,718	211,608	155,200
SaaS subscription and support and maintenance | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	104,291	72,121	200,641	138,897
On‑premise subscription | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	5,116	8,597	10,967	16,303
Non‑subscription revenue | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,231	5,520	12,288	11,765
Professional services
Disaggregation of Revenue [Line Items]
Total revenue	5,027	3,929	8,971	7,932
Professional services | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	5,027	3,929	8,971	7,932
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenue	1,204	1,591	3,317	3,833
Perpetual licenses | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,204	$ 1,591	$ 3,317	$ 3,833