Supplementary Balance Sheet Information (Tables)

9 Months Ended

Sep. 27, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	September 27,		December 31,
	2019		2018
Raw materials	$	78,489	$	69,008
Work-in-process		16,544		15,982
Finished goods		21,614		17,337
Demo and consigned inventory		1,926		2,437
Total inventories	$	118,573	$	104,764

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	September 27,		December 31,
	2019		2018
Accrued compensation and benefits	$	15,675	$	24,545
Accrued warranty		4,728		4,510
Contract liabilities, current portion		4,549		4,165
Deferred purchase price for acquisitions		27,027		—
Other		19,199		13,075
Total	$	71,178	$	46,295

Accrued Warranty

Accrued Warranty

	Nine Months Ended
	September 27, 2019			September 28, 2018
Balance at beginning of the period	$	4,510		$	4,835
Provision charged to cost of revenue		1,903			2,503
Warranty liabilities from acquisitions		175			—
Use of provision		(1,802	)		(2,243	)
Foreign currency exchange rate changes		(58	)		(54	)
Balance at end of the period	$	4,728		$	5,041

Other Long Term Liabilities

Other Long Term Liabilities

	September 27,		December 31,
	2019		2018
Finance lease obligations	$	14,960	$	7,275
Accrued pension liabilities		2,473		3,758
Accrued contingent considerations		14,998		3,376
Other		4,384		2,778
Total	$	36,815	$	17,187