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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 CNY (¥) item segment | Dec. 31, 2023 USD ($) item segment | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Feb. 28, 2022 | Dec. 31, 2020 CNY (¥)
Accounting Policies |  |  |  |  |  |  |  |  |
Net current liabilities | ¥ 730,466 |  |  |  |  | $ 102,884 |  |  |
Cash and cash equivalents, restricted cash and short term investments | ¥ 2,489,481 |  | ¥ 3,533,726 |  | ¥ 4,456,621 | $ 350,637 | $ 497,715 |  | ¥ 3,424,674
Closing foreign exchange rate of CNY per US$1.00 | 7.0999 |  |  |  |  | 7.0999 |  |  |
Proceeds from loans due to related parties | ¥ 900,000 | $ 126,763 | 300,000 |  | 1,192,455 |  |  |  |
Unrealized losses (downward adjustments) recognized | 0 | 0 | 0 |  | 0 |  |  |  |
Equity securities without readily determinable fair value, upward price adjustment | 0 | 0 | 22,452 |  | 82,492 |  |  |  |
Equity securities without readily determinable fair value cumulative loss | 13,582 |  | 14,940 |  | 0 | $ 1,913 |  |  |
Impairment of long lived assets | 653,670 | 92,067 | 0 |  |  |  |  |  |
Advertising expenses | 9,114 | 1,284 | 9,512 |  | 24,070 |  |  |  |
Employee benefit expenses | ¥ 389,146 | $ 54,810 | 431,929 |  | 310,126 |  |  |  |
Percentage of equity interests investment | 49.00% | 49.00% |  |  |  |  |  |  |
Cash Consideration Paid | ¥ 12,070 | $ 1,700 | 63,356 |  | ¥ 52,493 |  |  |  |
Fair value of equity interests | 30,273 |  | 44,808 |  |  | 4,264 |  |  |
Unrealized losses for the equity investments | 12,469 | $ 1,756 |  | $ 22,683 |  |  |  |  |
Accumulated deficit | ¥ (12,315,041) |  | (10,131,636) |  |  | $ (1,734,539) |  |  |
Percentage of ownership interest in equity investments without readily determinable fair value |  |  |  |  |  |  |  | 15.63% |
Number of reporting units | item | 2 | 2 |  |  |  |  |  |  |
Intangible assets with indefinite lives | ¥ | ¥ 0 |  | ¥ 0 |  |  |  |  |  |
Number of operating segments | segment | 1 | 1 |  |  |  |  |  |  |
VIEs and VIEs' subsidiaries |  |  |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |  |  |
Capital contribution provided | ¥ 1,347,145 | $ 189,741 |  |  |  |  |  |  |
Loan amount provided | 1,415,327 | 199,345 |  |  |  |  |  |  |
Proceeds from loans due to related parties | 2,000 | 282 |  |  |  |  |  |  |
Initial payment for certain fixed assets purchased | 370,511 | 52,185 |  |  |  |  |  |  |
Proceeds for services provided | 32,308 | 4,550 |  |  |  |  |  |  |
Payments for services received | ¥ 11,508 | $ 1,621 |  |  |  |  |  |  |

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