Accounts Receivable, net - Summary (Details) - CNY (¥)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Accounts receivable	¥ 302,200,000	¥ 429,049,000
Less: allowance for credit losses	(122,039,000)	(124,204,000)
Accounts receivable, net	180,161,000	304,845,000
Advertisement agent services
Accounts receivable	¥ 129,400,000	¥ 0
Minimum
Terms of accounts receivable	90 days
Maximum
Terms of accounts receivable	270 days

Term of accounts receivable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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