Summary of significant accounting policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 108,258	$ 80,727
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	102,201	74,482
Subscription | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	102,201	74,482
SaaS subscription and support and maintenance | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	96,350	66,776
On‑premise subscription | Subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	5,851	7,706
Non‑subscription revenue | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,057	6,245
Professional services
Disaggregation of Revenue [Line Items]
Total revenue	3,944	4,003
Professional services | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	3,944	4,003
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenue	2,113	2,242
Perpetual licenses | Non‑subscription revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,113	$ 2,242