Revenue - Disaggregation of revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue
Revenue	$ 62,928	$ 58,838	$ 55,733	$ 57,607	$ 56,622	$ 57,147	$ 52,790	$ 52,447	$ 235,106	$ 219,006	$ 214,481
Products and Licenses transferred at a point in time
Revenue
Revenue									130,848	121,426	120,358
Services transferred over time
Revenue
Revenue									104,258	97,580	94,123
EMEA
Revenue
Revenue									$ 111,568	$ 100,298	$ 104,878
Percent of total									47.00%	46.00%	49.00%
Americas
Revenue
Revenue									$ 80,057	$ 77,740	$ 68,646
Percent of total									34.00%	35.00%	32.00%
APAC
Revenue
Revenue									$ 43,481	$ 40,968	$ 40,957
Percent of total									19.00%	19.00%	19.00%
Subscription
Revenue
Revenue									$ 106,436	$ 89,153	$ 68,507
Maintenance and support
Revenue
Revenue									46,383	48,345	51,276
Professional services and other
Revenue
Revenue									6,321	8,008	15,197
Hardware products
Revenue
Revenue									$ 75,966	$ 73,500	$ 79,501