Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional information (Details)

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Commitments and Contingencies - Additional information (Details) - ATA Online Sale Transaction
¥ in Millions
1 Months Ended
Mar. 31, 2020
CNY (¥)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Long Term Purchase Commitment [Line Items]      
Total consideration | $   $ 200,000,000.0  
Accrual of loss contingency | $     $ 0
Alpha Advantage Global Limited and Dynamic Fame Limited      
Long Term Purchase Commitment [Line Items]      
Attorney's fees and other litigation costs | $   $ 15,000,000.0  
Mr. Xiaofeng Ma | Alpha Advantage Global Limited      
Long Term Purchase Commitment [Line Items]      
Loss contingency, damages sought, value ¥ 95.0    
Attorney's fees and other litigation costs 1.5    
Mr. Xiaofeng Ma | Dynamic Fame Limited      
Long Term Purchase Commitment [Line Items]      
Loss contingency, damages sought, value 5.0    
Attorney's fees and other litigation costs ¥ 0.5