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Property and equipment, net - Demo inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property and equipment, net      
Estimated life (years) 3 years    
Demo inventory - gross $ 2,443   $ 2,010
Less: Accumulated depreciation (615)   (516)
Demo inventory, net 1,828   $ 1,494
Depreciation expense relating to demo equipment $ 103 $ 57