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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Narratives (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Nov. 15, 2021 USD ($) class $ / shares shares	Oct. 27, 2021	Dec. 31, 2021 USD ($) vote $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 14, 2021 vote shares
Related Party Transaction
Commitments | $			$ 0.3
Common stock, par value (per share) | $ / shares			$ 0.0001	$ 0.0001
Preferred stock, shares authorized (shares)					10,000,000
Stock split ratio, common stock		0.10
Common Class A
Related Party Transaction
Classes of stock (class) | class	3
Share conversion ratio	1
Shares converted (in shares)	13,556,800
Convertible preferred stock
Related Party Transaction
Share conversion ratio	10
Shares converted (in shares)	42,031,390
Warrants
Related Party Transaction
Shares converted (in shares)	430,080
Common Class A
Related Party Transaction
Shares converted (in shares)			1
Common stock, shares issued (shares)			67,844,060	29,366,940
Common stock, shares authorized (shares)			1,000,000,000	95,000,000	1,000,000,000
Common Stock, Voting Right Per Share | vote			1		1
Common Class A | IPO
Related Party Transaction
Shares issued (shares)	11,190,392
Common stock, par value (per share) | $ / shares	$ 0.0001
Exercise price (usd per share) | $ / shares	$ 27.00
Proceeds from the sales of stock | $	$ 57.5
Payments for underwriting discounts and commission | $	4.9
Payments of deferred offering costs | $	$ 8.0
Common Class A | Public Stock Offering - New Shares
Related Party Transaction
Shares issued (shares)	2,608,696
Common Class A | Public Stock Offering - Shares From Existing Shareholders
Related Party Transaction
Shares issued (shares)	8,581,696
Common Class A | Public Stock Offering - Stock Options
Related Party Transaction
Shares issued (shares)	1,459,616
Common Stock, LT10
Related Party Transaction
Common stock, shares issued (shares)	7,332,640		7,332,640	0
Common stock, shares authorized (shares)			25,000,000	0	25,000,000
Common Stock, Voting Right Per Share | vote			10		10
Common Stock, LT50
Related Party Transaction
Common stock, shares issued (shares)	6,224,160		6,224,160	0
Common stock, shares authorized (shares)			25,000,000	0	25,000,000
Common Stock, Voting Right Per Share | vote			50		50
Subsidiaries | Expensify.Org
Related Party Transaction
Payment of donation commitments | $			$ 3.1	$ 0.1
Subsidiaries | Expensify.Org
Related Party Transaction
Donation commitment (percent)				10.00%

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