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v3.21.1

GOING CONCERN (Details) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 05, 2020 USD ($) | Oct. 05, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2017 CNY (¥)
Going Concern [Line Items] |  |  |  |  |  |  |  |
Liabilities in excess of assets |  |  |  |  |  |  | ¥ 219,466 |
Equity |  |  | $ 21,633 |  | ¥ 163,596 | ¥ 262,771 | 141,154 | ¥ 165,959
Unrestricted cash and cash equivalents |  |  | 18,210 |  | 157,600 | 211,436 | 118,821 |
Short term investments, available for sale |  |  | 18,062 |  | 57,487 |  | 117,854 |
Short term investments, held to maturity |  |  | 6,897 |  | 31,000 |  | 45,000 |
Net Cash Provided by (Used in) Operating Activities |  |  | $ 738 | ¥ 4,812 | ¥ (10,210) | ¥ 25,445 |  |
Net proceeds from the offering, after deducting the placement agent fees and other offering expenses | $ 5,210 | ¥ 35,515 |  |  |  |  |  |
Variable interest entities and subsidiaries of VIEs |  |  |  |  |  |  |  |
Going Concern [Line Items] |  |  |  |  |  |  |  |
Short term investments, available for sale |  |  |  |  |  |  | 117,854 |
Short term investments, held to maturity |  |  |  |  |  |  | ¥ 45,000 |

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