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CONSOLIDATED STATEMENTS OF CASH FLOWS - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net loss ¥ (304,900) ¥ (731,121) ¥ (1,094,112)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 73,466 76,073 53,025
Share-based compensation expense 17,393 31,899 183,349
Loss on disposals of property and equipment 3,011 175 432
Allowance for credit losses 12,756 28,006 31,476
Write-down of inventories 39,969 21,139 14,310
Investment income (6,100) (124) (6,232)
Interest expenses of convertible notes   73,081  
Foreign exchange losses/(gains) 11,061 (13,733) 8,205
Changes in operating assets and liabilities:      
Accounts receivable (585,486) (333,067) (1,127,262)
Notes receivable (42,289) 85,753 (103,280)
Inventories (52,956) 85,802 (329,237)
Prepayments and other current assets 51,982 21,551 (58,662)
Accounts and notes payable 317,234 119,814 922,880
Advance from customers (11,224) 1,019 11,330
Operating lease right-of use assets 73,007 81,378 (71,440)
Land use right (328) 10,930  
Accrued expenses and other liabilities (92,542) 29,342 116,736
Operating lease liabilities (72,002) (92,120) 65,730
Net cash used in operating activities (567,948) (504,203) (1,382,752)
Cash flows from investing activities:      
Purchase of short-term investments (1,288,080) (100,000) (1,480,018)
Maturity of short-term investments 430,623 100,124 1,548,882
Purchase of property and equipment (50,496) (37,047) (145,200)
Purchase of intangible assets (5,067) (13,057) (12,867)
Proceeds from sale of property and equipment and intangible assets 4,718 12,940 5,047
Cash paid for a business combination in previous years, net of cash acquired     (10,239)
Net cash used in investing activities (908,302) (37,040) (94,395)
Cash flows from financing activities:      
Proceeds from issuance of convertible note   1,384,218  
Proceeds from short-term borrowings 1,114,000 764,160 404,170
Repayment of short-term borrowings (779,000) (807,592) (215,842)
Acquisition of the redeemable non-controlling interest (5,044) (22,396) (13,697)
Proceeds from public offering, net of issuance costs 385,768    
Other financing activities   (15,680)  
Net cash provided by financing activities 715,724 1,302,710 174,631
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 5,042 117,469 (8,695)
(Decrease)/Increase in cash, cash equivalents, and restricted cash (755,484) 878,936 (1,311,211)
Cash, cash equivalents, and restricted cash at beginning of year 2,005,856 1,126,920 2,438,131
Cash, cash equivalents, and restricted cash at end of year 1,250,372 2,005,856 1,126,920
Supplemental cash flow information:      
Cash payments for interest (19,343) (20,957) (10,291)
Cash payments for income taxes (154) (1,220) (1,224)
Supplemental information for non-cash financing activities:      
Accretion on convertible redeemable preferred shares to redemption value (660,070) (509,281) ¥ (329,737)
Issuance of Series F preferred shares from conversion of the convertible notes   ¥ (1,631,564)  
Conversion of preferred shares to ordinary shares ¥ (7,570,417)