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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Treasury Stock (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 shares
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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |  |
Treasury stock, shares | 1,485,862 | 1,485,862 | 0
Repurchase of treasury stock value | $ 3,302 | ¥ 22,991 |

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