Supplementary Balance Sheet Information (Tables)

9 Months Ended

Sep. 29, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	September 29,		December 31,
	2017		2016
Raw materials	$	55,418	$	39,822
Work-in-process		13,272		8,012
Finished goods		16,634		9,511
Demo and consigned inventory		3,537		2,400
Total inventories	$	88,861	$	59,745

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	September 29,		December 31,
	2017		2016
Accrued compensation and benefits	$	16,631	$	9,647
Accrued warranty		4,773		3,142
Accrued restructuring		575		1,371
Accrued professional services		1,854		1,237
Accrued contingent considerations		2,800		2,775
Customer deposits		3,294		1,164
Other		11,013		7,612
Total	$	40,940	$	26,948

Accrued Warranty

Accrued Warranty

	Nine Months Ended
	September 29, 2017			September 30, 2016
Balance at beginning of the period	$	3,142		$	3,335
Provision charged to cost of revenue		2,084			1,050
Acquisition related warranty accrual		1,307			—
Use of provision		(1,818	)		(1,060	)
Foreign currency exchange rate changes		58			(25	)
Balance at end of period	$	4,773		$	3,300

Summary of Other Long Term Liabilities

Other Long Term Liabilities

	September 29,		December 31,
	2017		2016
Capital lease obligations	$	7,794	$	8,111
Accrued pension liabilities		5,256		5,957
Accrued contingent considerations		—		2,381
Other		2,018		2,264
Total	$	15,068	$	18,713