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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 |  |

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