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Summary of Significant Accounting Policies - Additional Information (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Customer
Segment
shares
Dec. 31, 2024
USD ($)
Customer
Dec. 31, 2023
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Highly liquid investments with an original maturity 90 days    
Deferred underwriting fee payable $ 200,000 $ 11,100,000 $ 1,500,000
Cash and cash equivalents inclusive of funds 23,100,000 49,300,000 0
Cash and cash equivalents   49,300,000 2,200,000
Allowance for credit losses 400,000 400,000  
Finance Lease, Liability   0 0
Goodwill and Intangible Asset Impairment   0 0
Foreign Currency Transaction Loss, before Tax   0.2  
Federal Depository Insurance coverage Limit   250,000,000  
Restricted cash 300,000 $ 300,000 0
Highly Liquid Investments With an Original Maturity Description   90 days  
Restricted Cash, Current 300,000 $ 300,000 0
Federal depository insurance coverage $ 250,000    
Number of customers | Customer 2    
Number of reportable segment | Segment 1    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Chief Executive Officer [Member]    
US Treasury and Government [Member]      
Summary of Significant Accounting Policies [Line Items]      
Debt Securities   30,600,000  
U S Government Money Market Fund [Member]      
Summary of Significant Accounting Policies [Line Items]      
Debt Securities   9,200,000  
Mutual Funds      
Summary of Significant Accounting Policies [Line Items]      
Cash and cash equivalents inclusive of funds $ 3,800,000 5,100,000  
Debt Securities   5,100,000  
U.S. Government Money Market Funds      
Summary of Significant Accounting Policies [Line Items]      
Cash and cash equivalents inclusive of funds   9,200,000  
U.S. Government Money Market Funds | Maximum [Member]      
Summary of Significant Accounting Policies [Line Items]      
Cash and cash equivalents inclusive of funds $ 100,000    
U.S. Government Treasury Securities      
Summary of Significant Accounting Policies [Line Items]      
Cash and cash equivalents inclusive of funds   30,600,000  
Accounts Receivable      
Summary of Significant Accounting Policies [Line Items]      
Allowance for credit losses   400,000 400,000
Accounts Receivable, after Allowance for Credit Loss   $ 0 $ 500,000
Accounts Receivable | Customer Concentration Risk      
Summary of Significant Accounting Policies [Line Items]      
Number of customers | Customer   1  
Accounts Receivable | Customer Concentration Risk | One Customer [Member]      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk   98.00% 98.00%
Accounts Receivable | Customer Concentration Risk | Customer One      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk 25.00% 98.00%  
Accounts Receivable | Customer Concentration Risk | Customer Two      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk 65.00%    
Revenue, Segment Benchmark [Member] | Customer Concentration Risk | One Customer [Member]      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk     100.00%
Revenue, Segment Benchmark [Member] | Customer Concentration Risk | First Customer In Two Customer [Member]      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk   77.00%  
Revenue, Segment Benchmark [Member] | Customer Concentration Risk | Second Customer In Two Customer [Member]      
Summary of Significant Accounting Policies [Line Items]      
Percentage of concentration risk   21.00%  
Common Stock [Member]      
Summary of Significant Accounting Policies [Line Items]      
Aggregate amount of contingent consideration equity shares | shares 2,600,000    
Common Stock [Member] | Maximum [Member]      
Summary of Significant Accounting Policies [Line Items]      
Earnout shares receivable | shares 15,000,000