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Property and equipment, net - Demo inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property and equipment, net      
Estimated life (years) 3 years   3 years
Demo inventory - gross $ 3,733   $ 3,733
Less: Accumulated depreciation (1,508)   (1,185)
Demo inventory, net 2,225   $ 2,548
Depreciation expense relating to demo equipment $ 352 $ 103