Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Current assets:
Cash and cash equivalents	$ 30,716	$ 28,235
Marketable securities	87,269	96,159
Accounts receivable-trade, net of allowances of $0	28,061	28,102
Accounts receivable-other	500	963
Inventories	29,238	29,139
Prepaid expenses and other current assets	3,031	2,497
Total current assets	178,815	185,095
Property and equipment, net	16,978	16,647
Intangible assets, net	1,378	1,571
Goodwill	43,030	43,030
Other assets	1,246	1,258
Total assets	241,447	247,601
Current liabilities:
Accounts payable	15,975	13,266
Accrued expenses	19,007	19,352
Deferred revenue	3,483	5,084
Total current liabilities	38,465	37,702
Other long-term liabilities	11,288	11,402
Commitments and contingencies (Note 5)
Stockholders' equity:
Common stock	2,408	2,384
Additional paid-in capital	745,990	746,020
Accumulated other comprehensive income (loss)	39	(64)
Accumulated deficit	(556,743)	(549,843)
Total stockholders' equity	191,694	198,497
Total liabilities and stockholders' equity	$ 241,447	$ 247,601