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SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) ¥ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 CNY (¥) | Jun. 30, 2020 CNY (¥) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 CNY (¥) | Jun. 30, 2020 CNY (¥) | Jun. 30, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Revenues | $ 26,678 | ¥ 172,251 | ¥ 155,463 | $ 46,751 | ¥ 301,856 | ¥ 245,742 |  |
Accounts receivable, net | 3,289 |  |  | 3,289 |  |  | ¥ 21,234 | ¥ 20,972
Deferred revenue | $ 21,106 |  |  | $ 21,106 |  |  | 136,274 | 163,699
K-12 Schools [Member] |  |  |  |  |  |  |  |
Revenues |  | 104,748 | 85,389 |  | 175,650 | 126,800 |  |
Deferred revenue |  |  |  |  |  |  | 111,106 | 126,564
CP&CE Programs |  |  |  |  |  |  |  |
Revenues |  | ¥ 67,503 | ¥ 70,074 |  | ¥ 126,206 | ¥ 118,942 |  |
Deferred revenue |  |  |  |  |  |  | ¥ 25,168 | ¥ 37,135

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