Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities:
Net income (loss)	$ 27,287	$ (222,962)	$ (184,780)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	17,460	10,741	3,853
Share-based compensation expense	136,562	127,525	107,529
Executive chairman long-term performance award	(144,617)	53,214	53,214
Non-cash operating leases expense	1,756	2,527	2,281
Non-cash postcombination compensation expense	0	32,430	0
Amortization of premium on short-term investments	(3,232)	(4,495)	277
Gain on sale of equity method investment	0	0	(17,889)
Impairment of other financial instruments	0	0	11,616
Other	1,669	736	649
Changes in operating assets and liabilities:
Accounts receivable	(11,202)	(4,556)	(2,577)
Settlements receivable	13,719	(11,894)	(6,762)
Network incentives receivable	(12,969)	(11,146)	(12,262)
Prepaid expenses and other assets	462	7,900	(8,621)
Accounts payable	(350)	(1,956)	254
Revenue share payable	19,754	31,451	21,015
Accrued expenses and other liabilities	15,112	14,983	22,257
Operating lease liabilities	(3,241)	(3,394)	(3,020)
Net cash provided by (used in) operating activities	58,170	21,104	(12,966)
Cash flows from investing activities:
Purchases of property and equipment	(2,418)	(762)	(2,319)
Capitalization of internal-use software	(18,794)	(11,889)	0
Business combination, net of cash acquired	0	(135,777)	0
Purchase of patents	0	0	(1,600)
Purchases of short-term investments	0	(892,430)	(70,495)
Sales of short-term investments	0	577,934	0
Maturities of short-term investments	92,000	501,534	77,400
Realized gain (loss) on investments	0	(94)	0
Sale of equity method investment	0	0	25,732
Net cash provided by investing activities	70,788	38,516	28,718
Cash flows from financing activities:
Proceeds from exercise of stock options, including early exercised stock options, net of repurchase of early exercised unvested options	203	5,289	9,249
Payment on acquisition-related contingent consideration	0	(53,067)	0
Proceeds from shares issued in connection with employee stock purchase plan	2,715	3,066	4,762
Taxes paid related to net share settlement of restricted stock units	(35,407)	(26,662)	(15,362)
Repurchase of common stock	(154,425)	(190,420)	(78,136)
Net cash used in financing activities	(186,914)	(261,794)	(79,487)
Decrease in cash, cash equivalents, and restricted cash	(57,956)	(202,174)	(63,735)
Cash, cash equivalents, and restricted cash - Beginning of period	989,472	1,191,646	1,255,381
Cash, cash equivalents, and restricted cash - End of period	931,516	989,472	1,191,646
Reconciliation of cash, cash equivalents, and restricted cash
Cash and cash equivalents	923,016	980,972	1,183,846
Restricted cash	8,500	8,500	7,800
Total cash, cash equivalents, and restricted cash	931,516	989,472	1,191,646
Supplemental disclosures of cash flow information:
Cash paid for operating lease liabilities	4,581	4,239	4,112
Cash paid for interest	0	0	0
Cash paid for income taxes	396	430	84
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment accrued and not yet paid	2,129	113	563
Share-based compensation capitalized to internal-use software	7,059	4,492	0
Repurchase of common stock, including excise tax, accrued and not yet paid	906	991	1,065
Vesting of early exercised stock options	$ 0	$ 0	$ 298