Accrued Expenses and Other - Summary Of Accrued Expenses And Other (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Accrued expenses and other
Employee compensation	$ 208	$ 213
Vacation	31	56
Deferred income	76	467
Warranty reserve	156	166	185
Professional fees	137	147
Other	574	573
Total	$ 1,182	$ 1,622