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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 12 Months Ended
Sep. 20, 2021
Dec. 31, 2021
USD ($)
segment
director
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Franchisor Disclosure [Line Items]          
Exchange ratio in reverse recapitalization 0.64        
Net Loss   $ (3,779) $ 0 $ 0  
Net loss after the reverse recapitalization   3,354 0 0  
Net loss attributable to legacy Nerdy holders prior to the reverse recapitalization   $ 23,546 24,663 22,439  
Right to appoint, number of directors | director   3      
Total number of directors | director   5      
Number of operating segments | segment   1      
Accumulated deficit   $ (439,708) (412,383)   $ 16,767
Deferred revenue       3,911  
Prepaid expenses   3,590 574    
Goodwill   $ 5,717 5,717    
Useful life of definite-lived intangible assets   10 years      
Advertising expenses   $ 44,393 29,293 20,550  
Defined contribution plan   $ 337 $ 138 $ 269  
Earnout Shares          
Franchisor Disclosure [Line Items]          
Earn-out consideration subject to forfeiture if achievement of stock price thresholds are not met within closing date 5 years        
Leasehold improvements          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   7 years      
Capitalized internal use software          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   4 years      
Minimum | Furniture & fixtures          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   1 year      
Minimum | Office equipment          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   1 year      
Minimum | Other          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   1 year      
Maximum | Furniture & fixtures          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   7 years      
Maximum | Office equipment          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   3 years      
Maximum | Other          
Franchisor Disclosure [Line Items]          
Useful life of long-lived assets   4 years