Supplementary Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Inventories

Inventories

	March 31,		December 31,
	2017		2016
Raw materials	$	43,457	$	39,822
Work-in-process		10,218		8,012
Finished goods		14,217		9,511
Demo and consigned inventory		3,127		2,400
Total inventories	$	71,019	$	59,745

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

	March 31,		December 31,
	2017		2016
Accrued compensation and benefits	$	11,666	$	9,647
Accrued warranty		3,925		3,142
Accrued restructuring		1,032		1,371
Accrued professional services		1,271		1,237
Accrued contingent considerations		2,531		2,775
Customer deposits		1,904		1,164
Other		8,612		7,612
Total	$	30,941	$	26,948

Accrued Warranty

Accrued Warranty

	Three Months Ended
	March 31, 2017			April 1, 2016
Balance at beginning of the period	$	3,142		$	3,335
Provision charged to cost of revenue		799			310
Acquisition related warranty accrual		419			—
Use of provision		(442	)		(393	)
Foreign currency exchange rate changes		7			(4	)
Balance at end of period	$	3,925		$	3,248

Summary of Other Long Term Liabilities

Other Long Term Liabilities

	March 31,		December 31,
	2017		2016
Capital lease obligations	$	8,007	$	8,111
Accrued pension liabilities		5,711		5,957
Accrued contingent considerations		—		2,381
Other		2,150		2,264
Total	$	15,868	$	18,713