Quarterly report [Sections 13 or 15(d)]

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

v3.25.2
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.