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SHORT TERM INVESTMENTS - Amortized cost, gross unrealized gain, estimated fair value (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity investments |  |
Amortized Cost | ¥ 45,000 | ¥ 31,000
Estimated Fair value | 45,000 | 31,000
Available-for-sale investments |  |
Amortized Cost | 117,000 | 56,000
Gross unrealized gain in accumulated other comprehensive income | 854 | 1,487
Estimated Fair value | ¥ 117,854 | ¥ 57,487

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