OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 05, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Offering costs					$ 190	$ 0
Depreciation and amortization expense		$ 800
Restructuring charges				$ 400	900
Credit loss expense					1,156	$ 1,326
COVID-19 Pandemic
Business Acquisition [Line Items]
Deferred revenue			$ 1,200		1,200
Credit loss expense			1,300
Public Equity Offering
Business Acquisition [Line Items]
Share price (in dollars per share)	$ 130.00
Number of shares issued	3,850
Total net proceeds	$ 484,000
Underwriting discounts and commissions	16,300
Offering costs	200
Dosh Holdings, Inc.
Business Acquisition [Line Items]
Purchase consideration	277,148
Cash	150,000
Adjustments and escrows	$ 6,200
Share price (in dollars per share)	$ 136.33
Dosh Holdings, Inc. | Common Stock
Business Acquisition [Line Items]
Value of shares of common stock	$ 117,354
Dosh Holdings, Inc. | Equity Option
Business Acquisition [Line Items]
Fair value of unvested options to purchase common stock	3,593		$ 7,600		$ 7,600
Proceeds from Issuance Initial Public Offering	$ 500,500