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Segment reporting and concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment reporting information
Revenues	$ 18,839	$ 21,192
United States
Segment reporting information
Revenues	11,409	13,393
United Kingdom
Segment reporting information
Revenues	2,555	3,082
The Netherlands
Segment reporting information
Revenues	1,723	1,652
Canada
Segment reporting information
Revenues	1,438	1,377
Others - principally Europe
Segment reporting information
Revenues	$ 1,714	$ 1,688

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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