STOCKHOLDER'S EQUITY AND SHARE-BASED COMPENSATION, Narrative (Details)		1 Months Ended	2 Months Ended	11 Months Ended	12 Months Ended
	Sep. 11, 2019 USD ($) $ / shares shares	Jan. 31, 2017 USD ($)	May 31, 2019 USD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) installment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Mar. 28, 2019 $ / shares shares	Jul. 26, 2018 shares
Share-based Compensation Arrangement [Abstract]
Common shares, outstanding (in shares)			38,000,000.0		38,034,389	36,182,783		36,200,000
Warrants to purchase common stock (in shares)								9,000,000
Common stock, shares authorized (in shares)					230,000,000	230,000,000
Common shares, issued (in shares)					38,034,389	36,182,783
Common stock, par value (in dollars per share) | $ / shares					$ 0.0001	$ 0.0001
Number of shares of common stock called by each warrant (in shares)					1
Warrant exercise price (in dollars per share) | $ / shares					$ 11.50
Warrants exercisable period on completion of business combination					30 days
Warrants expiration period					5 years
Percentage of conversion consideration less than the exchange consideration							10.00%
Percentage of outstanding warrants							99.51%
Warrant exchange (in shares)			1,800,000
Cash paid in warrant exchange | $		$ 0	$ 10,000,000.0	$ 0	$ 10,031,000	$ 0
Cash dividends | $		0		20,200,000	$ 0	$ 0
Underwriting Agreement
Share-based Compensation Arrangement [Abstract]
Common stock newly issued (in shares)	5,200,000
Stock price to redeem warrants (in dollars per share) | $ / shares	$ 12.75
Additional shares of common stock purchased (in shares)	782,608
Option period for the additional shares	30 days
Offering costs | $	$ 800,000
2018 Equity Compensation Plan
Share-based Compensation Arrangement [Abstract]
Shares reserved for issuance (in shares)					3,300,000			3,400,000
Tender Offer
Share-based Compensation Arrangement [Abstract]
Stock price to redeem warrants (in dollars per share) | $ / shares							$ 1.12
Number of shares of common stock called by each warrant (in shares)							0.201
Professional and legal fees | $					$ 900,000
Warrant Amendment
Share-based Compensation Arrangement [Abstract]
Stock price to redeem warrants (in dollars per share) | $ / shares							$ 1.00
Number of shares of common stock called by each warrant (in shares)							0.181
Stock options
Share-based Compensation Arrangement [Abstract]
Stock price to redeem warrants (in dollars per share) | $ / shares					$ 13.83	$ 10.00
Stock options | 2018 Equity Compensation Plan
Share-based Compensation Arrangement [Abstract]
Weighted-average non-vested period					2 years 3 months 18 days
Stock options term					10 years
Number of equal installments for options vesting | installment					4
Options non-vested (in shares)					2,900,000
RSUs granted (in shares)					475,000
Weighted-average grant date price (in dollars per share) | $ / shares					$ 4.38
Forfeited RSUs (in shares)					403,000
Unrecognized compensation expense | $					$ 7,200,000
Share-based compensation expense | $					$ 2,600,000	$ 1,000,000.0
RSUs | 2018 Equity Compensation Plan
Share-based Compensation Arrangement [Abstract]
Options vesting period					1 year
RSUs granted (in shares)					19,000.0	21,200
Weighted-average grant date price (in dollars per share) | $ / shares					$ 14.77	$ 9.91
Forfeited RSUs (in shares)					0	0
Aggregate fair value of the vested RSUs | $					$ 255,100
Unrecognized compensation expense | $					210,000.0
Share-based compensation expense | $					$ 192,500	$ 87,500
Options vested (in shares)					21,192
Class C and D
Share-based Compensation Arrangement [Abstract]
Share-based compensation expense | $		0		0		0
Performance Shares
Share-based Compensation Arrangement [Abstract]
Share-based compensation expense | $		$ 2,900,000		$ 1,800,000		$ 4,700,000
Intermex
Share-based Compensation Arrangement [Abstract]
Percentage of outstanding common stock owned								48.30%
FinTech
Share-based Compensation Arrangement [Abstract]
Percentage of outstanding common stock owned								51.70%
FinTech | Public Warrants
Share-based Compensation Arrangement [Abstract]
Number of warrants issued (in shares)					8,800,000
FinTech | Placement Warrants
Share-based Compensation Arrangement [Abstract]
Number of warrants issued (in shares)					200,000