Supplementary Balance Sheet Information (Tables)

3 Months Ended

Mar. 29, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	March 29,		December 31,
	2019		2018
Raw materials	$	69,305	$	69,008
Work-in-process		16,071		15,982
Finished goods		19,666		17,337
Demo and consigned inventory		1,742		2,437
Total inventories	$	106,784	$	104,764

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	March 29,		December 31,
	2019		2018
Accrued compensation and benefits	$	16,503	$	24,545
Accrued warranty		4,884		4,510
Contract liabilities, current portion		3,338		4,165
Other		16,449		13,075
Total	$	41,174	$	46,295

Accrued Warranty

Accrued Warranty

	Three Months Ended
	March 29, 2019			March 30, 2018
Balance at beginning of the period	$	4,510		$	4,835
Provision charged to cost of revenue		1,011			722
Use of provision		(657	)		(560	)
Foreign currency exchange rate changes		20			57
Balance at end of the period	$	4,884		$	5,054