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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narratives (Details)	1 Months Ended	12 Months Ended
	Nov. 30, 2021	Dec. 31, 2021 USD ($) segment contract	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 15, 2021 USD ($)	Jul. 31, 2021
Significant Accounting Policies
Capitalized software development costs		$ 4,900,000	$ 1,800,000	$ 1,700,000
Deferred offering costs		$ 0	0		$ 8,000,000.0
Number of performance obligations | contract		2
Contract assets		$ 8,000	1,165,000
Cashback rewards		239,000	0
Cashback rewards from contract revenue		1,100,000
Bonus payments as a percentage of stock options issued (percent)						45.00%
Bonus expense		48,416,000
Consideration revenue from vendors		$ 2,900,000	$ 1,000,000	$ 0
Number of reportable segments | segment		1
Executive Officer
Significant Accounting Policies
Bonus expense		$ 7,900,000
Stock options
Significant Accounting Policies
Share based compensation vesting period (years)		4 years
Restricted stock units
Significant Accounting Policies
Share based compensation vesting period (years)		8 years
Service period (in years)	1 year	1 year
Restricted stock units | Share-based Payment Arrangement, Nonemployee
Significant Accounting Policies
Service period (in years)	3 months
Restricted stock units | 2021 Incentive Plan
Significant Accounting Policies
Share based compensation vesting period (years)	3 years
Commercial building
Significant Accounting Policies
Property, plant and equipment useful life (years)		30 years
Capitalized software
Significant Accounting Policies
Property, plant and equipment useful life (years)		3 years
Computers and equipment
Significant Accounting Policies
Property, plant and equipment useful life (years)		3 years
Furniture and fixtures
Significant Accounting Policies
Property, plant and equipment useful life (years)		5 years
Software Development
Significant Accounting Policies
Bonus expense		$ 1,500,000

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