SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2023 USD ($) position	Dec. 31, 2022 USD ($) revenueCategory	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities		$ (135,987)	$ (123,958)	$ (63,598)
Cash and cash equivalents		$ 281,279	$ 498,726	$ 850,587
Number of revenue category | revenueCategory		3
2022 Restructuring Plan, Second Phase | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of planned additional employee termination | position	500
Expected annualized cost savings	$ 100,000
Internally-developed software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life		2 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life		1 year
Contract with third party merchants, term		12 months
Minimum | Computer hardware and purchased software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		3 years
Minimum | Office Equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		3 years
Minimum | Furniture and fixtures and other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		3 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, useful life		10 years
Contract with third party merchants, term		18 months
Maximum | Computer hardware and purchased software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		5 years
Maximum | Office Equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		5 years
Maximum | Furniture and fixtures and other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life of property and equipment		5 years