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Lease Liabilities - Summary of Detailed Information About In Lease Liabilities (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Effective interest rate     4.34%
Current ¥ 28,633 $ 4,041  
Non- current ¥ 31,374 4,428  
Lease Liabilities Current [Member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Maturity 2020    
Current ¥ 28,633 $ 4,041  
Lease Liabilities Current [Member] | Bottom of range [member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Effective interest rate 1.25% 1.25%  
Lease Liabilities Current [Member] | Top of range [member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Effective interest rate 6.20% 6.20%  
Lease Liabilities Noncurrent [Member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Non- current ¥ 31,374 $ 4,428  
Lease Liabilities Noncurrent [Member] | Bottom of range [member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Effective interest rate 1.25% 1.25%  
Maturity 2021    
Lease Liabilities Noncurrent [Member] | Top of range [member]      
Disclosure Of Detailed Information About Lease Liabilities [Line Items]      
Effective interest rate 6.20% 6.20%  
Maturity 2024