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v3.21.1

CONCENTRATIONS (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
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

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