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Short-term investments	9 Months Ended
Short-term investments	Sep. 30, 2021
Short-term investments
Short-term investments	5. Short-term investments Short-term investments are primarily comprised of time deposits with original maturities between three months and one year. The Group’s short-term investments consisted entirely of short-term held to maturity debt instruments with high credit ratings, which were determined to have remote risk of expected credit loss. Accordingly, no allowance for credit loss was recorded as of September 30, 2021 and December 31, 2020, respectively.