Supplementary Balance Sheet Information

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

10. Supplementary Balance Sheet Information

The following tables provide the details of selected balance sheet items as of the dates indicated (in thousands):

Inventories

	December 31,
	2019		2018
Raw materials	$	76,268	$	69,008
Work-in-process		15,096		15,982
Finished goods		23,431		17,337
Demo and consigned inventory		1,823		2,437
Total inventories	$	116,618	$	104,764

Property, Plant and Equipment, Net

	December 31,
	2019			2018
Cost:
Land, buildings and improvements	$	67,376		$	56,068
Machinery and equipment		87,471			77,918
Total cost		154,847			133,986
Accumulated depreciation		(77,291	)		(68,522	)
Property, plant and equipment, net	$	77,556		$	65,464

The Company capitalized software development costs of $0.2 million, $1.1 million and $2.0 million in 2019, 2018 and 2017, respectively, in accordance with the guidance in ASC 350-40, “Internal-Use Software.”

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,
	2019		2018		2017
Depreciation expense	$	11,835	$	11,442	$	9,838

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,
	2019		2018
Accrued compensation and benefits	$	15,359	$	24,545
Accrued warranty		5,756		4,510
Contract liabilities, current portion		3,219		4,165
Deferred purchase price for acquisitions		27,735		—
Other		18,257		13,075
Total	$	70,326	$	46,295

Accrued Warranty

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

	Year Ended December 31,
	2019			2018			2017
Balance at beginning of year	$	4,510		$	4,835		$	3,142
Provision charged to cost of revenue		2,360			3,111			3,169
Warranty liabilities acquired from acquisitions		142			—			1,307
Use of provision		(1,282	)		(3,341	)		(2,857	)
Foreign currency exchange rate changes		26			(95	)		74
Balance at end of year	$	5,756		$	4,510		$	4,835

Other Long Term Liabilities

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

	December 31,
	2019		2018
Finance lease obligations	$	14,845	$	7,275
Accrued pension liabilities		1,473		3,758
Accrued contingent considerations		16,504		3,376
Other		4,065		2,778
Total	$	36,887	$	17,187