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Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2023
USD ($)
Segment
Dec. 31, 2022
USD ($)
Significant Accounting Policies [Line Items]    
Allowance for doubtful accounts $ 0 $ 0
Amortization period description The amortization period begins with the first month of availability on our service.  
Number of reporting unit | Segment 1  
Impairment of goodwill $ 0 0
Impairment of long-lived assets 0 0
Uncertain tax positions 0  
Deferred revenue 15,861,000 14,124,000
Revenues 2,700,000 1,600,000
Marketing and advertising costs 33,100,000 30,500,000
Impairment charges on cost method investments 0 0
Defined Contribution Plan 401 (k) [Member]    
Significant Accounting Policies [Line Items]    
Defined contribution plan annual matching contribution amount $ 200,000 $ 300,000
Revenue | Customer Concentration Risk | One Third-Party Platform Partner [Member]    
Significant Accounting Policies [Line Items]    
Concentration of risk 15.00% 14.00%
Accounts Receivable | Customer Concentration Risk | One Third-Party Platform Partner [Member]    
Significant Accounting Policies [Line Items]    
Concentration of risk 51.00% 64.00%
Accounts Receivable | Customer Concentration Risk | Partner Two [Member]    
Significant Accounting Policies [Line Items]    
Concentration of risk 26.00% 16.00%
A La Carte Course Purchase [Member]    
Significant Accounting Policies [Line Items]    
Assets $ 0  
Liabilities $ 0  
Website Development Costs and Other Software [Member]    
Significant Accounting Policies [Line Items]    
Estimated useful life of property and equipment 3 years  
Minimum [Member]    
Significant Accounting Policies [Line Items]    
License period or estimated useful life of media library 12 months  
Voting interests, percentage 20.00%  
Maximum [Member]    
Significant Accounting Policies [Line Items]    
License period or estimated useful life of media library 90 months