SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) store businessDay segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Significant Accounting Policies [Line Items]
Losses, uninsured amount	$ 0
Losses, uninsured amount on foreign bank accounts	0
Write off from financial institution closure	$ 3,800,000
Accounts receivable, past due, charged off period	90 days
Invoice due from sending agent	5 days
Advertising costs	$ 1,200,000	$ 300,000	$ 1,000,000
Gain (loss) from foreign currency transactions	$ 100,000	200,000	$ (15,500)
Foreign currency transactions, settlement, threshold business days | businessDay	2
Amount of foreign exchange contracts opened	$ 12,700,000	56,900,000
Unrealized gain, foreign currency transaction	0	0
Wire transfers payable denominated in foreign currencies	23,000,000.0	40,700,000
Prepaid wires denominated in foreign currencies	$ 29,800,000	$ 17,800,000
Number of reportable segments | segment	1
Number of company-operated stores | store	117
Maximum
Significant Accounting Policies [Line Items]
Number of days recorded upon initiation of wire transfer	5 days
Agent relationships | Maximum
Significant Accounting Policies [Line Items]
Intangible assets, useful life (in years)	15 years
Trade names | Maximum
Significant Accounting Policies [Line Items]
Intangible assets, useful life (in years)	15 years
Developed technology | Maximum
Significant Accounting Policies [Line Items]
Intangible assets, useful life (in years)	15 years
Other intangibles | Maximum
Significant Accounting Policies [Line Items]
Intangible assets, useful life (in years)	10 years
Development of Internal Use Computer Software
Significant Accounting Policies [Line Items]
Internal use software, useful life (in years)	5 years
Development of Internal Use Computer Software | Maximum
Significant Accounting Policies [Line Items]
Internal use software, useful life (in years)	5 years
Remittance Volume | Paying Agent Concentration Risk | Banking, Financial Services, and Retail
Significant Accounting Policies [Line Items]
Largest paying agent by volume, percentage	25.00%