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v3.21.1

OTHER NON-CURRENT ASSETS, NET - Additional information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 CNY (¥) | Apr. 08, 2020
Additional information |  |  |  |  |  |  |
Interest income |  | $ 1,456 | ¥ 9,501 | ¥ 5,379 | ¥ 6,652 |  |
Dongyuan |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Annual interest rate of loan agreements |  |  |  |  |  | 5.00% |
Outstanding principle |  |  | 42,600 |  |  | ¥ 42,600 |
Interest receivable |  |  | 1,571 |  |  | 1,571 |
Allowance upon deposit loans and interest receivable |  |  | 0 |  |  | 0 |
Ten Tutoring Centers controlled by Beijing Xinganxian |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Long-term receivables |  |  | 13,723 |  |  | 13,723 |
Interest income |  |  | 1,925 | ¥ 958 |  |  |
Hebi School |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Ownership (as a percent) | 51.00% |  |  |  |  |  | 51.00%
Long-term Deposit | ¥ 40,000 |  | 40,000 |  |  | ¥ 40,000 |
Interest on security deposit, percentage | 10 |  |  |  |  |  |
Interest On Security Deposit, Value |  |  | ¥ 5,758 |  |  |  |

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