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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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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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