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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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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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