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Short-term investments - Summary of Short-term investments classification (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Schedule of Held-to-maturity Securities [Line Items]
Cost or Amortized cost	¥ 30,000	$ 4,708	¥ 80,000
Fair value	¥ 30,000	$ 4,708	¥ 80,000

X

- Definition

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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X

- Definition

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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