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ACCOUNTS RECEIVABLE, NET (Details) ¥ in Thousands, $ in Thousands | Jun. 30, 2021 USD ($) | Jun. 30, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | ---
ACCOUNTS RECEIVABLE, NET |  |  |
Accounts receivable |  | ¥ 28,447 | ¥ 27,219
Less: Allowance for doubtful accounts |  | (7,213) | (6,247)
Accounts receivable, net | $ 3,289 | ¥ 21,234 | ¥ 20,972

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