Supplementary Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	December 31,
	2020		2019
Raw materials	$	55,657	$	76,268
Work-in-process		15,487		15,096
Finished goods		20,234		23,431
Demo and consigned inventory		1,359		1,823
Total inventories	$	92,737	$	116,618

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net

	December 31,
	2020			2019
Cost:
Land, buildings and improvements	$	71,341		$	67,376
Machinery and equipment		93,494			87,471
Total cost		164,835			154,847
Accumulated depreciation		(86,159	)		(77,291	)
Property, plant and equipment, net	$	78,676		$	77,556

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,
	2020		2019		2018
Depreciation expense	$	13,200	$	11,835	$	11,442

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,
	2020		2019
Accrued compensation and benefits	$	12,510	$	15,359
Contingent consideration and earn-outs		10,796		3,813
Finance lease obligations		9,720		1,307
Contract liabilities, current portion		6,173		3,219
Accrued warranty		4,919		5,756
Deferred purchase price for acquisitions		—		27,735
Other		9,662		13,137
Total	$	53,780	$	70,326

Accrued Warranty

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

	Year Ended December 31,
	2020			2019			2018
Balance at beginning of year	$	5,756		$	4,510		$	4,835
Provision charged to cost of revenue		1,838			2,360			3,111
Warranty liabilities acquired from acquisitions		—			142			—
Use of provision		(2,805	)		(1,282	)		(3,341	)
Foreign currency exchange rate changes		130			26			(95	)
Balance at end of year	$	4,919		$	5,756		$	4,510

Other Long Term Liabilities

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

	December 31,
	2020		2019
Finance lease obligations	$	5,908	$	14,845
Accrued pension liabilities		1,511		1,473
Accrued contingent considerations and earn-outs		7,276		16,504
Other		2,471		4,065
Total	$	17,166	$	36,887