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ACCOUNTS RECEIVABLE, NET (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | ---
ACCOUNTS RECEIVABLE, NET |  |  |
Accounts receivable |  | ¥ 27,219 | ¥ 20,932
Less: Allowance for doubtful accounts |  | (6,247) | (2,993)
Accounts receivable, net | $ 3,214 | ¥ 20,972 | ¥ 17,939

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