Supplementary Balance Sheet Information (Tables)

9 Months Ended

Sep. 26, 2014

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	September 26, 2014		December 31, 2013
Raw materials	$	38,281	$	34,749
Work-in-process		11,069		9,744
Finished goods		11,403		10,682
Demo and consigned inventory		2,062		3,115
Total inventories	$	62,815	$	58,290

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	September 26, 2014		December 31, 2013
Accrued compensation and benefits	$	7,592	$	8,624
Accrued warranty		3,223		3,315
Customer deposits		524		551
Other		7,739		9,798
Total	$	19,078	$	22,288

Accrued Warranty

Accrued Warranty

	Nine Months Ended
	September 26, 2014			September 27, 2013
Balance at beginning of the period	$	3,315		$	2,204
Provision charged to cost of sales		1,361			1,382
Acquisition related warranty accrual		90			998
Use of provision		(1,529	)		(1,280	)
Foreign currency exchange rate changes		(14	)		1
Balance at end of period	$	3,223		$	3,305