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ORGANIZATION, CONSOLIDATION AND PRINCIPAL ACTIVITIES, Balance sheets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Current assets            
Cash and cash equivalents ¥ 1,213,767 $ 170,956 ¥ 1,049,999      
Accounts receivable, net of allowance of RMB5,407 and RMB5,926 (US$835) as of December 31, 2022 and 2023, respectively 60,832 8,568 79,614      
Inventories, net 16,518 2,327 19,127      
Amounts due from related parties 1,810 255 2,286      
Prepayments and other current assets 89,511 12,607 102,765      
Total current assets 1,382,438 194,713 1,253,791      
Non-current assets            
Property and equipment, net 6,169 869 9,205      
Intangible assets, net 23,245 3,274 24,872      
Operating lease right-of-use assets 3,648 514 12,782      
Long-term investment 26,333 3,709 26,333      
Other non-current assets 8,662 1,218 6,416      
Total non-current assets 68,057 9,584 79,608      
Total assets 1,450,495 204,297 1,333,399      
Current liabilities            
Accounts payable 22,139 3,118 24,206      
Deferred revenue and customer advances 318,587 44,872 379,063      
Amounts due to related parties 4,428 624 6,944      
Accrued expenses and other current liabilities 143,677 20,236 144,717      
Current operating lease liabilities 1,927 271 6,123      
Total current liabilities 490,758 69,121 561,053      
Non-current liabilities            
Non-current operating lease liabilities 1,933 272 2,894      
Total non-current liabilities 1,933 272 2,894      
Total liabilities 492,691 69,393 563,947      
Allowance for credit losses 5,926 835 5,407 $ 762 ¥ 381 ¥ 156
Related Party            
Current assets            
Amounts due from related parties 1,810 255 2,286      
Non-current assets            
Operating lease right-of-use assets 0   8,621      
Current liabilities            
Amounts due to related parties 4,428 624 6,944      
Current operating lease liabilities 0   4,616      
VIE            
Current assets            
Cash and cash equivalents 739,750 104,192 505,621      
Accounts receivable, net of allowance of RMB5,407 and RMB5,926 (US$835) as of December 31, 2022 and 2023, respectively 57,517 8,101 79,606      
Inventories, net 17,084 2,406 19,199      
Prepayments and other current assets 83,200 11,718 101,022      
Total current assets 1,017,618 143,328 818,681      
Non-current assets            
Property and equipment, net 5,935 836 8,909      
Intangible assets, net 17,033 2,399 16,554      
Operating lease right-of-use assets 3,648 514 9,777      
Long-term investment 26,333 3,709 26,333      
Other non-current assets 6,033 850 3,747      
Total non-current assets 58,982 8,308 65,320      
Total assets 1,076,600 151,636 884,001      
Current liabilities            
Accounts payable 21,702 3,057 23,781      
Deferred revenue and customer advances 317,270 44,687 379,063      
Accrued expenses and other current liabilities 106,256 14,966 105,897      
Current operating lease liabilities 1,927 271 4,626      
Total current liabilities 456,144 64,247 529,676      
Non-current liabilities            
Non-current operating lease liabilities 1,933 272 2,894      
Total non-current liabilities 1,933 272 2,894      
Total liabilities 458,077 64,519 532,570      
Allowance for credit losses 5,926 835 5,407      
Net asset 618,523 87,117 351,431      
VIE | Related Party            
Current assets            
Amounts due from related parties 120,067 16,911 113,233      
Current liabilities            
Amounts due to related parties 8,989 1,266 16,309      
VIE | Affiliated Entity            
Current assets            
Amounts due from related parties 118,806 16,733 111,494      
Current liabilities            
Amounts due to related parties 4,943 $ 696 11,489      
VIE | Asset pledged as collateral without right            
Non-current assets            
Total assets ¥ 0   ¥ 0