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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of noncurrent assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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CONCENTRATIONS (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
CONCENTRATIONS (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 CNY (¥) customer	Dec. 31, 2018 customer	Dec. 31, 2020 CNY (¥)
CONCENTRATIONS [Line Items]
Accounts receivable	$ 3,214	¥ 17,939		¥ 20,972
Prepaid and other current assets	18,028	133,296		117,634
Other non-current assets	$ 21,313	¥ 70,971		139,067
Total Revenue
CONCENTRATIONS [Line Items]
Number of customers \| customer	0	0	0
Concentration risk (as a percent)	10.00%	10.00%	10.00%
Total Cost of Sales
CONCENTRATIONS [Line Items]
Number of customers \| customer	0	0	0
Concentration risk (as a percent)	10.00%	10.00%	10.00%
Accounts receivable [Member] \| Credit risk [Member] \| Company A [Member]
CONCENTRATIONS [Line Items]
Concentration risk (as a percent)	15.00%	12.00%
Accounts receivable		¥ 2,089		3,145
Prepaid and other current assets [Member] \| Credit risk [Member] \| Company B [Member]
CONCENTRATIONS [Line Items]
Concentration risk (as a percent)	42.00%	37.00%
Prepaid and other current assets		¥ 49,800		49,800
Prepaid and other current assets [Member] \| Credit risk [Member] \| Company C [Member]
CONCENTRATIONS [Line Items]
Concentration risk (as a percent)	30.00%	26.00%
Prepaid and other current assets		¥ 35,000		35,000
Other Noncurrent Assets [Member] \| Credit risk [Member] \| Company D [Member]
CONCENTRATIONS [Line Items]
Concentration risk (as a percent)	65.00%	59.00%
Other non-current assets		¥ 42,211		89,929
Other Noncurrent Assets [Member] \| Credit risk [Member] \| Company E [Member]
CONCENTRATIONS [Line Items]
Concentration risk (as a percent)	10.00%	15.00%
Other non-current assets		¥ 10,773		¥ 13,723