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Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 15, 2024 USD ($) | Jun. 01, 2017 USD ($) | Feb. 01, 2012 USD ($) | Dec. 31, 2005 USD ($) | May 31, 2025 USD ($) | May 31, 2024 USD ($) | May 31, 2025 USD ($) Unit Segment | May 31, 2024 USD ($)
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  | 3 |
Deferred revenue |  |  |  |  | $ 58,393,597 |  | $ 58,393,597 |
Warranty payment |  | $ 100,000 | $ 75,000 | $ 50,000 |  |  |  |
Commission paid |  |  |  |  | 9,132 | $ 14,441 | 18,483 | $ 25,493
Additional capitalized contract acquisition costs, net of amortization expense |  |  |  |  | 29,391 | 31,490 | 60,841 | 61,669
Impairment of contract assets |  |  |  |  | 0 | 0 | 0 | 0
Uncertain tax provisions |  |  |  |  | 0 |  | 0 |
Provisions for interest or penalties related to uncertain tax positions |  |  |  |  |  |  | 0 | 0
Impairment on long lived assets |  |  |  |  | 0 | 0 | 0 | 0
Stock-based option compensation expense |  |  |  |  | 40,000 | 178,000 | 337,000 | 485,000
Unrealized holding (losses) gains, marketable securities |  |  |  |  | (379,332) | 258,623 | (410,733) | 533,594
Payment warranty |  |  |  | $ 50,000 |  |  |  |
Increased payment warranty |  | $ 100,000 | $ 75,000 |  |  |  |  |
Gain on interest rate swap | $ 228,000 |  |  |  | 0 | 151,175 | 0 | 105,887
Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Unrealized holding (losses) gains, marketable securities |  |  |  |  | $ (380,000) | $ 259,000 | $ (411,000) | $ 534,000
Duke University [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contracted storage amortization period |  |  |  |  | 16 years |  | 16 years |
Umbilical Cord Blood and Cord Tissue Stem Cell Service and PrepaCyte-CB [Member] | Duke University [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Inventory, in units | Unit |  |  |  |  |  |  | 6,000 |
Number of units, per month | Unit |  |  |  |  |  |  | 36 |
Maximum [Member] | Umbilical Cord Blood and Cord Tissue Stem Cell Service and PrepaCyte-CB [Member] | Duke University [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Inventory, in units | Unit |  |  |  |  |  |  | 36 |
Accounts Receivables [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Period of doubtful for accounts receivable due from client |  |  |  |  |  |  | 30 days |
Option One [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contracted storage amortization period |  |  |  |  | 1 year |  | 1 year |
Option Two [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contracted storage amortization period |  |  |  |  | 21 years |  | 21 years |
Option Three [Member] |  |  |  |  |  |  |  |
Business, Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contracted storage amortization period |  |  |  |  |  |  | life-time |
Contracted storage amortization description |  |  |  |  |  |  | The life-time storage plan is based on a life expectancy of 81 years, which is the current estimate by the Center for Disease Control for United States women’s life expectancy and concluded that additional data analysis would result in an immaterial difference in revenue. |

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