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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Bitcoin
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Bitcoin
Accounting Policies [Abstract]          
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description     The primary financial measure used by the CODM to evaluate performance is operating income (loss) as shown on the statements of operations. Segment expenses and other segment items are provided to the CODM on the same basis as disclosed in the statements of operations.    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]     srt:ChiefExecutiveOfficerMember    
Amortization expense on capitalized software development costs $ 200,000 $ 100,000 $ 400,000 $ 200,000  
Amortization expense write-offs 100,000 0 $ 100,000 0  
Notional amount of customer rewards liability outstanding | Bitcoin     81   92
Derivative instruments within customer rewards liability 9,300,000   $ 9,300,000   $ 8,600,000
Gain (loss) on remeasurement of derivative liability $ (500,000) $ 100,000 $ (1,500,000) $ (2,300,000)