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Consolidated Balance Sheets (Parenthetical)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
$ / shares
Accounts payable ¥ 80,793 $ 12,678 ¥ 78,267  
Deferred revenue 20,657 3,242 17,001  
Salary and welfare payable 123,075 19,312 93,288  
Taxes payable 5,564 872 5,809  
Short-term loans 68,999 10,827 39,508  
Lease liabilities due within one year 13,929 2,186 3,709  
Accrued expenses and other current liabilities 53,486 8,392 51,047  
Lease liabilities 17,076 2,680 587  
Other non-current liabilities ¥ 4,452 $ 699 ¥ 5,411  
Ordinary Shares A [Member]        
Ordinary shares, par value | $ / shares       $ 0.0001
Ordinary shares, shares authorized | shares 1,268,785,000 1,268,785,000 1,268,785,000  
Ordinary shares, shares issued | shares 798,962,260 798,962,260 710,249,520  
Ordinary shares, shares outstanding | shares 782,801,250 782,801,250 693,103,450  
Ordinary Shares B [Member]        
Ordinary shares, par value | $ / shares   $ 0.0001   $ 0.0001
Ordinary shares, shares authorized | shares 231,215,000 231,215,000 231,215,000  
Ordinary shares, shares issued | shares 231,215,000 231,215,000 231,215,000  
Ordinary shares, shares outstanding | shares 231,215,000 231,215,000 231,215,000  
Variable Interest Entity Primary Beneficiary [Member]        
Accounts payable ¥ 70,639   ¥ 73,986  
Deferred revenue 19,100   16,200  
Salary and welfare payable 116,204   88,464  
Short-term loans 68,999   39,508  
Lease liabilities due within one year 5,767   3,542  
Accrued expenses and other current liabilities 42,803   41,559  
Lease liabilities 4,132   587  
Other non-current liabilities 0   0  
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]        
Salary and welfare payable 116,200   88,500  
Taxes payable ¥ 4,900   ¥ 4,600