Segment and geographic information - Schedule of long-lived assets, net of accumulated depreciation and amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total	$ 6,169	$ 4,095
Ukraine
Segment Reporting Information [Line Items]
Total	2,267	1,340
Russia
Segment Reporting Information [Line Items]
Total	1,920	1,023
United States
Segment Reporting Information [Line Items]
Total	715	712
Serbia
Segment Reporting Information [Line Items]
Total	433	492
Poland
Segment Reporting Information [Line Items]
Total	313	528
Other
Segment Reporting Information [Line Items]
Total	$ 521	$ 0