Supplementary Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	December 31,
	2021		2020
Raw materials	$	84,038	$	55,657
Work-in-process		20,600		15,487
Finished goods		19,486		20,234
Demo and consigned inventory		1,533		1,359
Total inventories	$	125,657	$	92,737

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net

	December 31,
	2021			2020
Cost:
Land, buildings and improvements	$	78,906		$	71,341
Machinery and equipment		98,687			93,494
Total cost		177,593			164,835
Accumulated depreciation		(90,154	)		(86,159	)
Property, plant and equipment, net	$	87,439		$	78,676

Summary of Depreciation Expense on Property, Plant and Equipment, Including Demo Units and Assets under Finance Leases

The following table summarizes depreciation expense on property, plant and equipment, including demo units and assets under finance leases (in thousands):

	Year Ended December 31,
	2021		2020		2019
Depreciation expense	$	13,529	$	13,200	$	11,835

Accrued Expenses and Other Current Liabilities

The following table summarizes accrued expenses and other current liabilities as of the dates indicated (in thousands):

	December 31,
	2021		2020
Accrued compensation and benefits	$	24,725	$	12,510
Accrued contingent considerations and earn-outs		47,522		10,796
Finance lease obligations		599		9,720
Contract liabilities, current portion		6,995		6,173
Accrued warranty		4,783		4,919
Other		13,855		9,662
Total	$	98,479	$	53,780

Accrued Warranty

The following table summarizes changes in accrued warranty for the periods indicated (in thousands):

	Year Ended December 31,
	2021			2020			2019
Balance at beginning of year	$	4,919		$	5,756		$	4,510
Provision charged to cost of revenue		1,410			1,838			2,360
Warranty liabilities acquired from acquisitions		874			—			142
Use of provision		(2,326	)		(2,805	)		(1,282	)
Foreign currency exchange rate changes		(94	)		130			26
Balance at end of year	$	4,783		$	4,919		$	5,756

Other Long Term Liabilities

The following table summarizes other long term liabilities as of the dates indicated (in thousands):

	December 31,
	2021		2020
Finance lease obligations	$	5,309	$	5,908
Accrued pension liabilities		—		1,511
Accrued contingent considerations and earn-outs		3,402		7,276
Other		927		2,471
Total	$	9,638	$	17,166