Balance Sheet Components (Tables)

9 Months Ended

Sep. 28, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Supplemental Balance Sheet Disclosures

	As of
	September 28, 2014			December 29, 2013
	(in thousands)
Inventories:
Raw materials	$	—		$	19
Work-in-process	1,133			1,343
Finished goods	5,745			2,774
	$	6,878		$	4,136
Other current assets:
Prepaid expenses	$	880		$	845
Other	84			427
	$	964		$	1,272
Property and equipment:
Equipment	$	13,883		$	13,294
Software	3,332			3,349
Furniture and fixtures	710			710
Leasehold improvements	646			640
	18,571			17,993
Accumulated depreciation and amortization	(15,682		)	(15,153		)
	$	2,889		$	2,840
Accrued liabilities:
Employee related accruals	$	1,452		$	2,821
Other	387			698
	$	1,839		$	3,519