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SHORT-TERM INVESTMENTS - Amortized cost, gross unrealized gain, estimated fair value (Details) - CNY (¥) ¥ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-maturity investments |  |
Amortized Cost | ¥ 2,000 | ¥ 45,000
Estimated Fair value | 2,000 | 45,000
Available-for-sale investments |  |
Amortized Cost | 84,500 | 117,000
Gross unrealized gain in accumulated other comprehensive income | 1,152 | 854
Estimated Fair value | ¥ 85,652 | ¥ 117,854

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