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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Number of grantees affected by modification of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 15, 2021 USD ($)	Sep. 20, 2021 Year $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 19, 2021 $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 21, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 54,960	$ 1,730	$ 1,747
Compensation cost not yet recognized			$ 146,253		$ 146,253
Compensation cost not yet recognized, weighted-average period					3 years 8 months 1 day
2021 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance under various stock-based compensation awards (up to) \| shares								27,775
Maximum term of award			10 years
Sales and marketing expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 3,378	0	0
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					51,039	$ 1,730	$ 1,747
UARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees affected \| Year		437
Stock-based compensation expense	$ 3,697				$ 32,066
Former employees	362
UARs \| Minimum \| Nerdy LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
UARs \| Maximum \| Nerdy LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					5 years
UARs \| Sales and marketing expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 124				$ 2,457
UARs \| General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,573				$ 29,609
PIUs \| Minimum \| Nerdy LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
PIUs \| Maximum \| Nerdy LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					6 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional hurdle price (in dollars per share) \| $ / shares		$ 4.00
Expected dividends					0.00%	0.00%	0.00%
Granted (in shares) \| shares			0	0
Fair Value (per award) \| $ / shares			$ 0	$ 0		$ 0.83	$ 0.59
contractual term						7 years	7 years 18 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial stock price hurdle (in dollars per share) \| $ / shares		$ 18.00
Vesting, stock price, percentage		100.00%
Award vesting rights, maximum (in dollars per share) \| $ / shares		$ 42.00
Granted (in shares) \| shares					8,905,388	0	0
Vest date fair value					$ 189
Fair Value (per award) \| $ / shares					$ 5.71
Restricted stock units \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion, right to receive (in shares) \| shares		1
Employee Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 408
Granted (in shares) \| shares					188,958
Fair Value (per award) \| $ / shares					$ 11.50
Employee Warrants \| Valuation, Market Approach
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value (per award) \| $ / shares					$ 2.16
Employee Warrants \| Sales and marketing expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 79
Employee Warrants \| General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					329
Employee Earnout
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					2,763
Employee Earnout \| Sales and marketing expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					46
Employee Earnout \| General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 2,717
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends					0.00%
contractual term					4 years 3 months 10 days
Restricted stock units - founder's award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares					9,258,298
Requisite service period					4 years 8 months 12 days
Fair Value (per award) \| $ / shares					$ 5.06
contractual term					7 years
Software and Software Development Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 543	$ 0	$ 0