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Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Significant Accounting Policies [Line Items]      
Applicable tax rate 25.00% 25.00% 25.00%
Preferential tax Rate 15.00%    
Preferential Tax Rate, Usage Term 3 years    
Leasehold Improvements      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets Over the lease terms    
Music Education Equipment      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets 5 years    
Enterprise [Member] | High and New Technology Enterprises [Member]      
Disclosure Of Significant Accounting Policies [Line Items]      
Applicable tax rate 15.00%    
Bottom of Range | Furniture and Fixtures      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets 3 years    
Bottom of Range | Office Equipment      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets 3 years    
Top of Range | Furniture and Fixtures      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets 4 years    
Top of Range | Office Equipment      
Disclosure Of Significant Accounting Policies [Line Items]      
Estimated useful lives of assets 5 years