Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
Revenue:
Product	$ 9,898	$ 5,724
Service	5,482	5,985
Total revenue	15,380	11,709
Cost of revenue:
Product	4,368	4,673
Service	1,894	2,212
Total cost of revenue	6,262	6,885
Gross profit	9,118	4,824
Operating expenses:
Research and development	6,485	7,311
Sales and marketing	2,670	2,600
General and administrative	1,985	2,126
Restructuring	(271)
Total operating expenses	10,869	12,037
Loss from operations	(1,751)	(7,213)
Interest and other income, net	234	768
Loss before income taxes	(1,517)	(6,445)
Income tax expense	97	94
Net loss	$ (1,614)	$ (6,539)
Net loss per share:
Basic	$ (0.06)	$ (0.23)
Diluted	$ (0.06)	$ (0.23)
Weighted average shares outstanding:
Basic	28,741	28,451
Diluted	28,741	28,451