Summary of status of options granted under stock option plans and changes in options outstanding (Detail)	3 Months Ended
	Jan. 31, 2016 $ / shares shares
Shares
Options Outstanding at beginning of year | shares	1,240,100
Options granted | shares	51,192
Options exercised | shares	(5,250)
Options canceled or expired | shares	(21,703)
Options outstanding at end of year | shares	1,264,339
Options exercisable at end of year | shares	773,321
Options vested and expected to vest at end of year | shares	1,257,911
Weighted Average Exercise Price
Options outstanding at beginning of year | $ / shares	$ 2.64
Options granted | $ / shares	4.42
Options exercised | $ / shares	3.72
Options canceled or expired | $ / shares	5.42
Options outstanding at end of year | $ / shares	3.43
Options exercisable at end of year | $ / shares	3.03
Options vested and expected to vest at end of year | $ / shares	$ 3.66