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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets and Others (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
Impairment of long-lived assets |  |  |  |  |
Impairment of the Group's long-lived assets | ¥ 0 | ¥ 0 | ¥ 0 |  |
Long-term investments |  |  |  |  |
Long-term investments |  | 11,140 |  | $ 20 | ¥ 140
Impairment on long-term investments | ¥ 11,000 | 0 | ¥ 0 |  |
Equity method investments |  |  |  |  |
Long-term investments |  |  |  |  |
Long-term investments |  | ¥ 11,140 |  |  | ¥ 140

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