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v3.21.1

SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2020 CNY (¥) segment | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 CNY (¥)
Number of Operating Segments | segment | 2 | 2 |  |  |
Revenues | $ 81,529 | ¥ 531,980 | ¥ 583,909 | ¥ 531,508 |
Accounts receivable, net | 3,214 |  | 17,939 |  | ¥ 20,972
Unsatisfied performance obligation |  |  | 165,111 | 124,250 |
Deferred revenue | $ 25,088 |  | 165,111 |  | 163,699
K-12 Schools [Member] |  |  |  |  |
Revenues |  | 291,539 | 313,747 | 277,790 |
Deferred revenue |  |  | 96,301 |  | 126,564
CP&CE Programs |  |  |  |  |
Revenues |  | ¥ 240,441 | 270,162 | ¥ 253,718 |
Deferred revenue |  |  | ¥ 68,810 |  | ¥ 37,135

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