Balance Sheet Details (Tables)

9 Months Ended

Sep. 27, 2014

Balance Sheet Related Disclosures [Abstract]

Summary of accounts receivable, net

Accounts receivable, net consisted of the following (in thousands):

	September 27, 2014			December 31, 2013
Accounts receivable	$	43,598		$	44,642
Allowance for doubtful accounts	(256		)	(358		)
Product return reserve	(561		)	(764		)
Accounts receivable, net	$	42,781		$	43,520

Summary of inventory

Inventory consisted of the following (in thousands):

	September 27, 2014		December 31, 2013
Raw materials	$	3,946	$	6,591
Finished goods	39,899		44,480
Total inventory	$	43,845	$	51,071

Summary of property and equipment, net

Property and equipment, net consisted of the following (in thousands):

	September 27, 2014			December 31, 2013
Test equipment	$	39,590		$	36,932
Computer equipment and software	30,127			27,280
Furniture and fixtures	1,766			1,614
Leasehold improvements	6,386			7,077
Total	77,869			72,903
Accumulated depreciation and amortization	(57,710		)	(55,430		)
Property and equipment, net	$	20,159		$	17,473

Summary of accrued liabilities

Accrued liabilities consisted of the following (in thousands):

	September 27, 2014		December 31, 2013
Accrued warranty	$	10,775	$	10,856
Accrued compensation and related benefits	14,398		13,127
Accrued professional and consulting fees	3,429		1,634
Accrued excess and obsolete inventory at contract manufacturers	481		756
Accrued customer rebates	971		712
Accrued business travel expenses	1,019		540
Sales and use tax payable	711		521
Income taxes payable	566		368
Accrued other	5,229		3,561
Total accrued liabilities	$	37,579	$	32,075

Summary of deferred revenue

Deferred revenue consisted of the following (in thousands):

	September 27, 2014		December 31, 2013
Product and services - current	$	17,330	$	32,051
Extended warranty - current	2,765		2,811
Extended warranty - non-current	18,728		18,335
Product and services - non-current	79		96
Total deferred revenue	$	38,902	$	53,293