Supplementary Balance Sheet Information (Tables)

9 Months Ended

Sep. 28, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	September 28,		December 31,
	2018		2017
Raw materials	$	61,509	$	57,277
Work-in-process		16,369		14,847
Finished goods		18,374		16,443
Demo and consigned inventory		2,665		2,711
Total inventories	$	98,917	$	91,278

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	September 28,		December 31,
	2018		2017
Accrued compensation and benefits	$	23,926	$	17,348
Accrued warranty		5,041		4,835
Customer deposits		3,392		3,634
Other		16,306		17,497
Total	$	48,665	$	43,314

Accrued Warranty

Accrued Warranty

	Nine Months Ended
	September 28, 2018			September 29, 2017
Balance at beginning of the period	$	4,835		$	3,142
Provision charged to cost of revenue		2,503			2,084
Warranty liabilities acquired from acquisitions		—			1,307
Use of provision		(2,243	)		(1,818	)
Foreign currency exchange rate changes		(54	)		58
Balance at end of period	$	5,041		$	4,773