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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Consolidating Balance Sheets (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 18,210 | ¥ 118,821 | ¥ 157,600 | ¥ 211,436
Amounts due from related parties | 463 | 3,024 | 2,318 |
Prepaid expenses and other current assets | 18,028 | 117,634 | 133,296 |
Total current assets | 65,000 | 424,129 | 399,640 |
Non-current assets: |  |  |  |
Other non-current assets, net | 21,313 | 139,067 | 70,971 |
Total non-current assets | 95,876 | 625,588 | 621,159 |
Total assets | 160,876 | 1,049,717 | 1,020,799 |
Current liabilities: |  |  |  |
Amounts due to related parties | 390 | 2,543 | 1,971 |
Accrued and other liabilities | 32,121 | 209,590 | 192,957 |
Short-term borrowings | 1,533 | 10,000 |  |
Total current liabilities | 98,635 | 643,595 | 608,984 |
Non-current liabilities: |  |  |  |
Total non-current liabilities | 40,608 | 264,968 | 248,219 |
Total liabilities | 139,243 | 908,563 | 857,203 |
SHAREHOLDERS' EQUITY |  |  |  |
(US$ 0.003 par value; 1,666,667 shares authorized, nil issued and outstanding as of December 31, 2019 and 2020) |  |  |  |
Additional paid-in capital | 543,306 | 3,545,073 | 3,508,745 |
Accumulated other comprehensive income | 1,855 | 12,101 | 6,341 |
Total shareholders' equity | 21,935 | 143,122 | 164,276 |
Total liabilities and shareholders' equity | 160,876 | 1,049,717 | 1,020,799 |
Class A Ordinary Shares [Member] |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |
Ordinary shares | 122 | 794 | 730 |
Class C Ordinary Shares [Member] |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |
Ordinary shares | 14 | 90 | 90 |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 35 | 226 | 652 |
Amounts due from related parties | 38,170 | 249,057 | 273,715 |
Prepaid expenses and other current assets | 32 | 211 | 2,349 |
Total current assets | 38,237 | 249,494 | 276,716 |
Non-current assets: |  |  |  |
Other non-current assets, net | 83 | 544 |  |
Total non-current assets | 83 | 544 |  |
Total assets | 38,320 | 250,038 | 276,716 |
Current liabilities: |  |  |  |
Amounts due to related parties | 14,484 | 94,510 | 85,358 |
Accrued and other liabilities | 1,901 | 12,406 | 27,082 |
Total current liabilities | 16,385 | 106,916 | 112,440 |
Non-current liabilities: |  |  |  |
Total liabilities | 16,385 | 106,916 | 112,440 |
SHAREHOLDERS' EQUITY |  |  |  |
Additional paid-in capital | 543,306 | 3,545,073 | 3,508,745 |
Accumulated deficit | (523,362) | (3,414,936) | (3,351,630) |
Accumulated other comprehensive income | 1,855 | 12,101 | 6,341 |
Total shareholders' equity | 21,935 | 143,122 | 164,276 |
Total liabilities and shareholders' equity | 38,320 | 250,038 | 276,716 |
Reportable Legal Entities [Member] | Parent Company [Member] | Class A Ordinary Shares [Member] |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |
Ordinary shares | 122 | 794 | 730 |
Reportable Legal Entities [Member] | Parent Company [Member] | Class C Ordinary Shares [Member] |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |
Ordinary shares | $ 14 | ¥ 90 | ¥ 90 |

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