Significant Accounting Policies - Long-term investments and Revenue recognition (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue recognition
Impairment of equity method investment	¥ 0	¥ 0	¥ 0
Maximum economic benefit period from paid columns and online courses	1 year
Revenues	¥ 316,779	386,764	655,606
Contract assets		0	0
Revenue recognized included in contract liabilities balance at the beginning of the period	18,850	8,160	4,230
Online advertising services
Revenue recognition
Revenues	214,722	172,811	283,426
Integrated marketing
Revenue recognition
Revenues	1,342	133,599	250,344
Offline events
Revenue recognition
Revenues	32,127	26,992	53,861
Consulting
Revenue recognition
Revenues	36,867	32,622	15,264
Advertisement agent services
Revenue recognition
Revenues	3,696
Enterprise value-added services
Revenue recognition
Revenues	74,032	193,213	319,469
Institutional investor subscription services
Revenue recognition
Revenues	25,490	16,036	20,039
Enterprise subscription services
Revenue recognition
Revenues	94	361	2,077
Individual subscription services
Revenue recognition
Revenues	2,441	4,343	30,595
Subscription services
Revenue recognition
Revenues	¥ 28,025	¥ 20,740	¥ 52,711

The amount of contract assets recorded in the balance sheet.

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- Definition

The maximum economic benefit period that can be derived from paid columns and online courses provided by the company.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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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.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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