Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 26, 2013	Jul. 31, 2012
Current assets:
Cash and cash equivalents	$ 36,544	$ 136,654
Short-term investments	27,940	234,965
Accounts receivable, net of allowance for doubtful accounts of $42 at January 26, 2013 and July 31, 2012	8,440	7,785
Inventories	9,162	8,469
Prepaid and other current assets	1,328	1,589
Total current assets	83,414	389,462
Property and equipment, net	3,357	4,276
Long-term investments		67,774
Other assets	322	422
Total assets	87,093	461,934
Current liabilities:
Accounts payable	1,440	1,432
Accrued compensation	1,510	2,836
Accrued warranty	1,075	1,072
Accrued expenses	1,550	2,248
Accrued restructuring costs	232
Deferred revenue	6,187	7,871
Other current liabilities	1,021	813
Total current liabilities	13,015	16,272
Long term deferred revenue	1,563	1,469
Other long term liabilities	1,960	1,962
Total liabilities	16,538	19,703
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $.01 par value; 5,000 shares authorized; none issued or outstanding
Common stock, $.001 par value; 250,000 shares authorized; 28,882 and 28,879 shares issued and outstanding at January 26, 2013 and July 31, 2012, respectively	29	29
Additional paid-in capital	1,229,757	1,589,357
Accumulated deficit	(1,158,878)	(1,146,882)
Accumulated other comprehensive loss	(353)	(273)
Total stockholders' equity	70,555	442,231
Total liabilities and stockholders' equity	$ 87,093	$ 461,934