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Segment reporting and concentrations - Additional information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) customer	Sep. 30, 2021 customer	Sep. 30, 2022 USD ($) customer segment	Sep. 30, 2021 customer	Dec. 31, 2021 USD ($) customer
Segment reporting information
Number of reportable segments | segment			3
Right-of-use-asset, net | $	$ 4,199		$ 4,199		$ 5,621
Classification of segment assets | $	$ 47,809		$ 47,809		$ 59,217
Foreign Customer | Sales Revenue, Net | Customer Concentration Risk | Non-US
Segment reporting information
Concentration risk, percentage	35.00%	46.00%	37.00%	47.00%
Foreign Customer | Accounts receivable | Customer Concentration Risk
Segment reporting information
Concentration risk, percentage			47.00%		37.00%
One Client | Sales Revenue, Net | Customer Concentration Risk | United States
Segment reporting information
Number of clients			1	1
Concentration risk, percentage			13.00%	11.00%
One Client | Sales Revenue, Net | Customer Concentration Risk | Non-US
Segment reporting information
Number of clients		1
Concentration risk, percentage		10.00%
One Client | Accounts receivable | Customer Concentration Risk
Segment reporting information
Number of clients					1
Concentration risk, percentage					19.00%
Another Client | Accounts receivable | Customer Concentration Risk
Segment reporting information
Number of clients			2
Concentration risk, percentage			24.00%
Client | Sales Revenue, Net | Customer Concentration Risk | United States
Segment reporting information
Number of clients	0
Concentration risk, percentage	10.00%
Client | Sales Revenue, Net | Customer Concentration Risk | Non-US
Segment reporting information
Number of clients			0	0
Client | Accounts receivable | Customer Concentration Risk
Segment reporting information
Number of clients			0		0
Concentration risk, percentage			10.00%		10.00%

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