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Description of the business - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Oct. 31, 2013
Jul. 31, 2013
Oct. 31, 2012
Cash and cash equivalents $ 9,436 $ 9,914 $ 8,019 $ 5,927 $ 7,103
Additional paid-in capital 65,584 59,968 59,376    
Noncontrolling interest, FreshRealm   (309)      
Proceeds from issuance of FreshRealm stock 10,000        
Overstated [Member]
          
Cash and cash equivalents   10,000      
Additional paid-in capital   5,400      
Noncontrolling interest, FreshRealm   4,600      
Proceeds from issuance of FreshRealm stock $ 10,000        
Error correction description Our management evaluated the materiality of these errors both qualitatively and quantitatively in accordance with Staff Accounting Bulletin No. 99, Materiality, and determined that these errors were not material to our previously reported quarterly financial statements as of and for the three and six months ended April 30, 2014. The aforementioned errors have no impact on this Quarterly Report on Form 10-Q, nor any future periodic filings, except that the Consolidated Condensed Statement of Cash Flows for the six months ended April 30, 2014 will be corrected to properly reflect this immaterial error in our Form 10-Q for the quarter ended April 30, 2015.