Balance Sheet Components (Tables)

12 Months Ended

Dec. 28, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Supplemental Balance Sheet Disclosures

	December 28, 2014			December 29, 2013
	(in thousands)
Inventories:
Raw materials	$	—		$	19
Work-in-process	1,191			1,343
Finished goods	3,761			2,774
	$	4,952		$	4,136
Other current assets:
Prepaid expenses	$	1,042		$	845
Other	104			427
	$	1,146		$	1,272
Property and equipment:
Equipment	$	14,047		$	13,294
Software	3,332			3,349
Furniture and fixtures	710			710
Leasehold improvements	595			640
	18,684			17,993
Accumulated depreciation and amortization	(15,467		)	(15,153		)
	$	3,217		$	2,840
Accrued liabilities:
Employee related accruals	$	1,356		$	2,821
Other	218			698
	$	1,574		$	3,519