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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 02, 2012 | Dec. 31, 2005 | May 31, 2014 CompensationPlan | May 31, 2013 | May 31, 2014 Deliverables CompensationPlan | May 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 |  |  | $ 10,443,000 |  | $ 10,443,000 |  | $ 10,852,000
U.S. Income tax expense |  |  | 0 |  | 0 |  |
Foreign income tax expense |  |  | 25,000 | 43,000 | 73,000 | 85,000 |
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 |
Impairment on long lived assets |  |  | 0 | 0 | 0 | 0 |
Writing off abandoned patent and trademarks |  |  | 25,649 | 378,837 | 25,649 | 378,837 |
Number of employee stock based compensation plan |  |  | 3 |  | 3 |  |
Stock option compensation expense |  |  | 56,000 | 72,000 | 208,000 | 162,000 |
Unrealized holding gain and loss |  |  | 7,354 | 2,010 | 22,879 | 2,390 |
Payment warranty |  | 50,000 |  |  |  |  |
Increased payment warranty | 75,000 |  |  |  |  |  |
Additional payment warranty | 10,000 |  |  |  |  |  |
Reserves recorded under programs |  |  | $ 16,162 |  | $ 16,162 |  | $ 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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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