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Additional Information of the Parent Company - Condensed Statements of Cash Flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Cash flows from operating activities: |  |  |  |
Net loss | ¥ (475,968) | $ (67,039) | ¥ (300,765) | ¥ (244,827)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation and amortization | 86,268 | 12,151 | 53,634 | 28,231
Loss from equity in earnings of subsidiaries | 45 | 6 | 45 | 84
Share-based compensation | 234,624 | 33,046 | 105,219 | 54,283
Fair value change of short-term investments | (15,095) | (2,126) | 4,878 | (7,717)
Foreign exchange loss (gain), net | (9) | (1) | (5,868) | 10,945
Changes in operating assets and liabilities: |  |  |  |
Prepayments and other current assets | (82,646) | (11,640) | (33,556) | (48,618)
Amounts due from related parties |  |  |  | 24,788
Accrued expenses and other current liabilities | 80,297 | 11,310 | (41,074) | 170,125
Net cash used in operating activities | 57,261 | 8,065 | (696,015) | (228,386)
Cash flows from investing activities: |  |  |  |
Purchases of short-term investments | (5,100,868) | (718,442) | (5,586,764) | (4,812,942)
Maturity of short-term investments | 4,479,302 | 630,896 | 6,978,764 | 3,114,287
Purchases of property and equipment | (406,748) | (57,289) | (231,210) | (220,096)
Investments in subsidiaries | (17,506) |  |  |
Net cash used in investing activities | (1,060,393) | (149,354) | 1,119,646 | (1,980,237)
Cash flows from financing activities: |  |  |  |
Cash contribution from shareholders in connection with the 2021 Reorganization | 17,506 | 2,466 |  | 507,620
Proceeds from issuance of convertible loans |  |  |  | 1,950,338
Proceeds from issuance of ordinary shares | 1,225,470 | 172,604 |  | 453,978
Payment of offering costs | (22,828) | (3,215) | (3,296) |
Proceeds from issuance of ordinary shares upon the exercise of share options | 2,872 | 405 |  |
Net cash provided by financing activities | 1,590,356 | 223,998 | 15,176 | 2,403,726
Net increase (decrease) in cash and cash equivalents | 587,224 | 82,709 | 438,807 | 195,103
Cash, cash equivalents and restricted cash, beginning of the year | 913,277 | 128,632 | 449,352 | 256,688
Effect of foreign exchange rate changes on cash and cash equivalents | 57,623 | 8,116 | 25,118 | (2,439)
Cash, cash equivalents and restricted cash, end of the year | 1,558,124 | 219,457 | 913,277 | 449,352
Supplemental disclosure of non-cash financing activities: |  |  |  |
Accrued purchases of property and equipment | 179,839 | 25,330 | 102,181 | 114,446
Accrued offering cost |  |  | 480 |
Parent company | Reportable legal entities |  |  |  |
Cash flows from operating activities: |  |  |  |
Net loss | (475,968) | (67,039) | (300,765) | (244,827)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation and amortization | 3 | 1 | 2 |
Loss from equity in earnings of subsidiaries | 420,259 | 59,192 | 263,662 | 95,699
Share-based compensation | 42,379 | 5,969 | 33,342 | 35,056
Fair value change of short-term investments | (12,500) | (1,761) |  |
Foreign exchange loss (gain), net | 12 | 2 | (2) | 2,324
Changes in operating assets and liabilities: |  |  |  |
Prepayments and other current assets | (1,544) | (217) | (545) | (496)
Amounts due from related parties |  |  |  | (255)
Accrued expenses and other current liabilities | 6,281 | 885 | 2,611 | 24,746
Net cash used in operating activities | (21,078) | (2,968) | (1,695) | (87,753)
Cash flows from investing activities: |  |  |  |
Purchases of short-term investments | (742,287) | (104,552) |  |
Maturity of short-term investments | 176,302 | 24,832 |  |
Purchases of property and equipment |  |  | (10) |
Investments in subsidiaries | (379,237) | (53,414) |  | (2,787,570)
Net cash used in investing activities | (945,222) | (133,134) | (10) | (2,787,570)
Cash flows from financing activities: |  |  |  |
Cash contribution from shareholders in connection with the 2021 Reorganization | 17,506 | 2,466 |  | 507,620
Proceeds from issuance of convertible loans |  |  |  | 1,950,338
Proceeds from issuance of ordinary shares | 1,225,470 | 172,604 |  | 453,978
Payment of offering costs | (22,828) | (3,215) |  |
Proceeds from issuance of ordinary shares upon the exercise of share options | 2,872 | 405 |  |
Collection of payments due to subsidiaries | 14,024 | 1,975 |  |
Net cash provided by financing activities | 1,237,044 | 174,235 |  | 2,911,936
Net increase (decrease) in cash and cash equivalents | 270,744 | 38,133 | (1,705) | 36,613
Cash, cash equivalents and restricted cash, beginning of the year | 35,411 | 4,988 | 36,160 |
Effect of foreign exchange rate changes on cash and cash equivalents | 57,623 | 8,116 | 956 | (453)
Cash, cash equivalents and restricted cash, end of the year | ¥ 363,778 | $ 51,237 | 35,411 | 36,160
Supplemental disclosure of non-cash financing activities: |  |  |  |
Accrued purchases of property and equipment |  |  |  | ¥ 1,950,338
Accrued offering cost |  |  | ¥ 480 |

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