Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Assets
Cash and cash equivalents	$ 21,147	$ 24,062
Short-term investments	3,360	3,360
Accounts receivable, net of allowance for doubtful accounts of $66 at October 31, 2011 and $249 at April 30, 2011	1,583	1,851
Inventories	4,637	4,689
Other current assets	397	327
Total current assets	31,124	34,289
Long-term investments	100	100
Property and equipment, net	851	1,164
Purchased intangibles, net	101	441
Other assets	3,894	4,724
Total assets	36,070	40,718
Liabilities and Stockholders' Equity
Accounts payable	1,261	858
Accrued expenses	1,552	1,632
Deferred revenue	1,235	530
Income taxes payable	57	50
Total current liabilities	4,105	3,070
Commitments and contingencies (Note 9)
Common stock, $0.001 par value: 55,000 shares authorized and 26,581 shares issued and outstanding at October 31, 2011, and 200,000 shares authorized and 26,545 shares issued and outstanding at April 30, 2011	26	26
Additional paid-in capital	268,560	268,348
Accumulated deficit	(236,621)	(230,726)
Total stockholders' equity	31,965	37,648
Total liabilities and stockholders' equity	$ 36,070	$ 40,718