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Consolidated Balance Sheets
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Current assets:          
Cash and cash equivalents ¥ 519,849 $ 71,219 ¥ 615,096 ¥ 905,451  
Restricted cash 2,313 317 120 19,817  
Accounts receivable (net of allowance of RMB38,396 and RMB 45,867 (US$ 6,284) as of December 31, 2023 and 2024, respectively) 152,013 20,826 126,858    
Contract assets (net of allowance of RMB58,790 and RMB 61,856 (US$ 8,474) as of December 31, 2023 and 2024, respectively) 13,855 1,898 22,748    
Inventories, net 62,625 8,580 69,020    
Prepayments and other current assets 25,963 3,557 50,254    
Total current assets 776,618 106,397 884,096    
Non-current assets:          
Equity method investment 0 0 337    
Convertible note receivable 0 0 5,320    
Property and equipment, net 47,152 6,460 131,912    
Intangible assets, net 421 58 964    
Operating right-of-use assets 53,188 7,287 12,284    
Other non-current assets 7,926 1,086 5,088    
Total non-current assets 108,687 14,891 155,905    
TOTAL ASSETS 885,305 121,288 1,040,001    
Current liabilities (including amounts of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB214,820 and RMB216,696 (US$29,687) as of December 31, 2023 and 2024, respectively):          
Accounts payable 33,747 4,623 18,061    
Deferred revenue 117,895 16,152 130,537    
Accrued liabilities and other current liabilities 89,498 12,262 104,935    
Customer deposits 592 81 1,197    
Current portion of operating lease liabilities 24,567 3,366 8,634    
Total current liabilities 266,299 36,484 263,364    
Non-current liabilities (including amounts of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB4,288 and RMB36,840 (US$5,049) as of December 31, 2023 and 2024, respectively):          
Other non-current liabilities 10,425 1,428 4,537    
Non-current portion of operating lease liabilities 27,754 3,802 3,690    
Total non-current liabilities 38,179 5,230 8,227    
TOTAL LIABILITIES 304,478 41,714 271,591    
Shareholders' equity:          
Treasury stock (63,264) (8,667) (65,896)    
Additional paid-in capital 5,002,255 685,306 4,849,337    
Accumulated deficits (4,200,261) (575,433) (3,853,635)    
Accumulated other comprehensive loss (158,048) (21,652) (161,533)    
Total shareholders' equity 580,827 79,574 768,410 ¥ 1,158,341 ¥ 1,845,311
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 885,305 121,288 1,040,001    
Common Class A [Member]          
Shareholders' equity:          
Ordinary shares 124 17 116    
Common Class B [Member]          
Shareholders' equity:          
Ordinary shares ¥ 21 $ 3 ¥ 21