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Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 04, 2023 shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) $ / shares
Significant Accountings Policies [Line Items]
Loan origination costs		$ 1,700	$ 1,100	$ 4,200	$ 2,600
Unrecognized tax benefits, income tax penalties and interest accrued		2,500		2,500		$ 2,000
Interest expense and penalties				20	4
Accrued interest expense and penalties		50	20	50	20
Valuation allowance		27,400
FDIC insured amount		48,900		$ 48,900		$ 61,100
Allowance for credit losses average term				11 days
Capitalized costs for internally developed software		1,700	1,700	$ 4,800	5,500
Advertising costs		16,400	12,500	40,100	32,300
Activation costs		$ 2,500	$ 2,400	$ 6,200	$ 6,400
Effective income tax rate				50.00%
Accounts receivable, noncurrent, threshold period past due, writeoff		120 days		120 days
Computation of diluted net income excluded \| shares		412,857	86,354	474,176	613,956
Reverse stock split, description	32-for-1 reverse stock split effected on January 4, 2023
Reverse stock split, conversion ratio	32
Number of warrants exercisable per common stock \| shares	32
Minimum [Member]
Significant Accountings Policies [Line Items]
Property, plant and equipment, useful life		3 years		3 years
Accounts receivable, noncurrent, threshold period past due		12 days		12 days
Maximum [Member]
Significant Accountings Policies [Line Items]
Property, plant and equipment, useful life		7 years		7 years
Class A common stock [Member]
Significant Accountings Policies [Line Items]
Common Stock, Par Value \| $ / shares		$ 0.0001		$ 0.0001		$ 0.0001
Class V common stock [Member]
Significant Accountings Policies [Line Items]
Common Stock, Par Value \| $ / shares		$ 0.0001		$ 0.0001		$ 0.0001
Public and Private Warrants [Member]
Significant Accountings Policies [Line Items]
Computation of diluted net income excluded \| shares		11,444,235		11,444,235
Earnout Shares [Member]
Significant Accountings Policies [Line Items]
Computation of diluted net income excluded \| shares			49,653		49,653
Members' Usage of Out-of-Network [Member]
Significant Accountings Policies [Line Items]
ATM-related fees		$ 700	$ 700	$ 2,300	$ 2,300
Transaction based revenue, net [Member]
Significant Accountings Policies [Line Items]
ATM-related fees		$ 600	$ 500	$ 1,800	$ 1,500
Computer Software, Intangible Asset [Member]
Significant Accountings Policies [Line Items]
Finite-lived intangible asset, useful life		3 years		3 years