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Segment reporting and concentrations - Additional information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) client segment	Mar. 31, 2021	Dec. 31, 2021 USD ($) client
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	3
Classification of segment assets | $	$ 54,934		$ 59,217
Foreign Customer [Member] | Accounts receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	31.00%		19.00%
One Client [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk | US
Segment Reporting Information [Line Items]
Number of clients	1
Concentration Risk, Percentage	21.00%	12.00%
Another client [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk | US
Segment Reporting Information [Line Items]
Number of clients	0
Concentration Risk, Percentage	10.00%
Another client [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk | Non-US
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	37.00%	49.00%
Three Clients [Member] | Accounts receivable
Segment Reporting Information [Line Items]
Number of clients			37
Three Clients [Member] | Accounts receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	31.00%		10.00%

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