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Commitments and Contingencies - Additional Information (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Commitments And Contingencies Disclosure [Line Items]      
Operating lease, expenses ¥ 6,509 $ 1,008 ¥ 7,640
Consulting Service for Lease Term within One Year      
Commitments And Contingencies Disclosure [Line Items]      
Future minimum payment under non-cancellable purchase commitment ¥ 0    
Maximum [Member] | Office Premise [Member]      
Commitments And Contingencies Disclosure [Line Items]      
Operating Lease term of contract 5 years    
Minimum [Member] | Office Premise [Member]      
Commitments And Contingencies Disclosure [Line Items]      
Operating Lease term of contract 6 months