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

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