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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Impact on consolidated balance sheet adoption of ASC 842 (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Jan. 01, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |  |
Prepayments and other current assets | $ 29,965 | ¥ 208,604 | ¥ 159,776 | ¥ 161,147 |  |
Operating lease right-of-use assets | 12,620 | 87,855 | 62,408 |  |  |
Total assets | 231,305 | 1,610,293 | 1,607,455 | 1,546,418 |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accrued expenses and other current liabilities | 33,613 | 234,008 | 122,056 | 102,261 |  |
Long-term operating lease liabilities | 8,189 | 57,011 | 41,242 |  |  |
Total liabilities | 120,138 | 836,370 | 383,691 | 322,654 |  |
Total equity | 111,167 | 773,923 | 1,223,764 | 1,223,764 | ¥ (944,704) | ¥ (688,003)
Total liabilities and equity | $ 231,305 | ¥ 1,610,293 | 1,607,455 | ¥ 1,546,418 |  |
Restatement adjustment | ASU No. 201602 |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Prepayments and other current assets |  |  | (1,371) |  |  |
Operating lease right-of-use assets |  |  | 62,408 |  |  |
Total assets |  |  | 61,037 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  | 19,795 |  |  |
Long-term operating lease liabilities |  |  | 41,242 |  |  |
Total liabilities |  |  | 61,037 |  |  |
Total liabilities and equity |  |  | ¥ 61,037 |  |  |

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