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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 |  |

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