Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 02, 2012
Jun. 30, 2013
sqft
Dec. 31, 2005
Aug. 31, 2014
CompensationPlan
May 31, 2014
Aug. 31, 2013
May 31, 2013
Aug. 31, 2014
Deliverables
CompensationPlan
Aug. 31, 2013
Nov. 30, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]                    
Number of deliverables for revenue recognized               2    
Deferred revenue recognition period               12 months    
Valuation allowance       $ 10,280,000       $ 10,280,000   $ 10,852,000
U.S. Income tax expense       0       0    
Foreign income tax expense       25,000   42,000   98,000 127,000  
Minimum percentage probability of realized tax benefit on settlement               50.00%    
Provisions for interest or penalties related to uncertain tax positions       0   0   0 0  
Uncertain tax provisions       0   0   0 0  
Writing off abandoned patent and trademarks         26,000   379,000 25,649 378,837  
Area of building lease terminated   9,600                
Lease termination fee           150,000     150,000  
Number of employee stock based compensation plan       3       3    
Stock option compensation expense       48,000   63,000   255,000 225,000  
Unrealized holding gain and loss       34,560   394   11,680 1,996  
Payment warranty     50,000              
Increased payment warranty 75,000                  
Additional payment warranty 10,000                  
Reserves recorded under programs       $ 16,453       $ 16,453   $ 15,608
Minimum [Member]
                    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]                    
Contracted storage periods               1 year    
Maximum [Member]
                    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]                    
Contracted storage periods               21 years