Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2021	Dec. 31, 2023 USD ($) Vote $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Jul. 16, 2021 $ / shares shares	Jan. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares		$ 2.35	$ 2.32
Aggregate intrinsic value of the stock options exercised		$ 8,700	$ 4,400
Number of shares purchased from issuance of warrants (in shares) | shares		15,642,220	16,746,194	14,325,000
Weighted Average Exercise Price | $ / shares				$ 11.50
Stock compensation expense		$ 24,151	$ 22,498
Unrecognized compensation expense		$ 200
Weighted average period expected of recognition		6 months
Finback Common Stock Warrants 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased from issuance of warrants (in shares) | shares					131,713
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 9,387	10,038
Finback BDA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased from issuance of warrants (in shares) | shares					2,552,913
Weighted Average Exercise Price | $ / shares					$ 0.42
Fair value of shares		$ 19,500
Shares issuable upon exercise of warrant (in shares) | shares		117,423
Aggregate intrinsic value of warrants exercisable		$ 500
Class of warrant or right, unissued (in shares) | shares		1,199,904
Intrinsic value of warrants unvested		$ 9,100
Number of warrants exercised (in shares) | shares		1,103,873
Finback BDA | Expected term (in years)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement input | Vote		3.0
Finback BDA | Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 3,100	4,500
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of restricted stock		$ 33,000	24,900
Vesting period		3 years
Total fair value of shares vested		$ 10,100	$ 3,800
Unvested performance stock units | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Unvested performance stock units | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Unvested Stock Options and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 40,800
Weighted average period expected of recognition		2 years 1 month 6 days
Maximum | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock may be issued (in shares) | shares		21,177,295
Annual increase of total common shares outstanding		5.00%
Number of shares remained available for future grant (in shares) | shares		14,007,370
Threshold percentage		100.00%
2021 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of stock option		10 years
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares remained available for future grant (in shares) | shares		6,315,248		3,435,748
Percent of increase of outstanding number of common stock	1.00%