Research and development (Tables)

12 Months Ended

Dec. 31, 2021

Research and development [Abstract]

Schedule of research and development

	Year Ended December 31,
	2021		2020		2019
Payroll and related expenses	$	53,683	$	45,716		39,142
Rent and maintenance		1,851		2,117		1,721
Subcontractors and projects		3,482		2,676		2,398
Travel and entertainment		185		20		314
Vehicle costs		232		270		355
Recruiting expenses		178		127		222
Depreciation and amortization		2,100		1,813		1,135
Other		3,830		1,638		1,286
	$	65,541	$	54,377	$	46,573