STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands |
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3 Months Ended |
9 Months Ended |
12 Months Ended |
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Oct. 15, 2021
USD ($)
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Sep. 20, 2021
Year
$ / shares
shares
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Mar. 31, 2022
USD ($)
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Dec. 31, 2021
USD ($)
$ / shares
shares
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Mar. 31, 2021
USD ($)
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Sep. 19, 2021
$ / shares
shares
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Dec. 31, 2021
USD ($)
$ / shares
shares
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Dec. 31, 2020
USD ($)
$ / shares
shares
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Dec. 31, 2019
USD ($)
$ / shares
shares
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Sep. 21, 2021
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 54,960
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$ 1,730
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$ 1,747
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| Compensation cost not yet recognized |
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$ 146,253
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$ 146,253
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| Compensation cost not yet recognized, weighted-average period |
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3 years 8 months 1 day
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| 2021 Equity Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares reserved for issuance under various stock-based compensation awards (up to) | shares |
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27,775
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| Maximum term of award |
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10 years
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| Sales and marketing expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 3,378
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0
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0
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| General and administrative expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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51,039
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$ 1,730
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$ 1,747
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| UARs |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of employees affected | Year |
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437
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| Stock-based compensation expense |
$ 3,697
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$ 32,066
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| Former employees |
362
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| UARs | Minimum | Nerdy LLC |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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4 years
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| UARs | Maximum | Nerdy LLC |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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5 years
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| UARs | Sales and marketing expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
$ 124
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$ 2,457
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| UARs | General and administrative expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
$ 3,573
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$ 29,609
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| PIUs | Minimum | Nerdy LLC |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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4 years
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| PIUs | Maximum | Nerdy LLC |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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6 years
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| Restricted stock awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Additional hurdle price (in dollars per share) | $ / shares |
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$ 4
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| Expected dividends |
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0.00%
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0.00%
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0.00%
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| Granted (in shares) | shares |
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0
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0
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| Fair Value (per award) | $ / shares |
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$ 0
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$ 0
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$ 0.83
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$ 0.59
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| contractual term |
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7 years
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7 years 18 days
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| Restricted stock units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Initial stock price hurdle (in dollars per share) | $ / shares |
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$ 18
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| Vesting, stock price, percentage |
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100.00%
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| Award vesting rights, maximum (in dollars per share) | $ / shares |
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$ 42
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| Granted (in shares) | shares |
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8,905,388
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0
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0
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| Vest date fair value |
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$ 189
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| Fair Value (per award) | $ / shares |
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$ 5.71
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| Restricted stock units | Class A Common Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Conversion, right to receive (in shares) | shares |
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1
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| Employee Warrants |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 408
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| Granted (in shares) | shares |
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188,958
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| Fair Value (per award) | $ / shares |
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$ 11.5
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| Employee Warrants | Valuation, Market Approach |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Fair Value (per award) | $ / shares |
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$ 2.16
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| Employee Warrants | Sales and marketing expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 79
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| Employee Warrants | General and administrative expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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329
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| Employee Earnout |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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2,763
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| Employee Earnout | Sales and marketing expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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46
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| Employee Earnout | General and administrative expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 2,717
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| Stock appreciation rights |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected dividends |
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0.00%
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| contractual term |
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4 years 3 months 10 days
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| Restricted stock units - founder's award |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted (in shares) | shares |
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9,258,298
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| Requisite service period |
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4 years 8 months 12 days
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| Fair Value (per award) | $ / shares |
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$ 5.06
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| contractual term |
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7 years
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| Software and Software Development Costs [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 606
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$ 0
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$ 543
|
$ 0
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$ 0
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