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Segment reporting and concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 21,192	$ 15,967
US
Segment Reporting Information [Line Items]
Revenues	13,393	8,220
United Kingdom
Segment Reporting Information [Line Items]
Revenues	3,082	2,802
The Netherlands
Segment Reporting Information [Line Items]
Revenues	1,652	1,654
Canada
Segment Reporting Information [Line Items]
Revenues	1,377	1,595
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	$ 1,688	$ 1,696

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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