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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
¥ in Thousands, $ in Thousands
Jun. 30, 2021
CNY (¥)
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
$ / shares
Short-term borrowings ¥ 19,498 $ 3,020 ¥ 10,000  
Deferred revenue 136,274 21,106 163,699  
Accounts payable 21,425 3,320 19,423  
Accrued and other liabilities 203,207 31,473 209,590  
Income taxes payable, current 185,105 28,669 184,638  
Amounts due to related parties 2,771 429 2,543  
Operating lease liability, current 49,198 7,620 53,702  
Long-term borrowing     9,594  
Other non-current liabilities 304 47 292  
Income taxes payable, non-current 34,322 5,316 34,763  
Operating lease liability, non-current ¥ 207,877 $ 32,196 ¥ 220,319  
Preferred shares, par value (in dollars per share) | $ / shares   $ 0.003   $ 0.003
Preferred shares, shares authorized | shares 1,666,667 1,666,667 1,666,667  
Preferred shares, shares issued | shares 0 0 0  
Preferred shares, shares outstanding | shares 0 0 0  
Class A Ordinary Shares [Member]        
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.003   0.003
Ordinary shares, shares authorized | shares 66,666,667 66,666,667 66,666,667  
Ordinary shares, shares issued | shares 41,948,276 41,948,276 41,923,276  
Ordinary shares, shares outstanding | shares 41,948,276 41,948,276 41,923,276  
Class C Ordinary Shares [Member]        
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.003   $ 0.003
Ordinary shares, shares authorized | shares 8,333,333 8,333,333 8,333,333  
Ordinary shares, shares issued | shares 4,708,415 4,708,415 4,708,415  
Ordinary shares, shares outstanding | shares 4,708,415 4,708,415 4,708,415  
Variable interest entities and subsidiaries of VIEs        
Short-term borrowings ¥ 10,000   ¥ 10,000  
Deferred revenue 132,947   158,735  
Accounts payable 10,346   10,682  
Accrued and other liabilities 168,420   165,706  
Income taxes payable, current 180,666   180,070  
Amounts due to related parties 2,771   2,543  
Operating lease liability, current 24,014   27,962  
Long-term borrowing 0   0  
Other non-current liabilities 95   188  
Income taxes payable, non-current 34,322   34,763  
Operating lease liability, non-current ¥ 71,459   ¥ 74,725