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Warrant liabilities - Warrant liability is measured at fair value (Details) - Level 3 - Government Warrants - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Warrant liabilities |  |
Fair value as at beginning | ¥ 80,270 | ¥ 40,635
Change in fair value included in losses | ¥ 111,299 | 39,635
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fair Value Adjustment of Warrants |
Settlement | ¥ (191,569) |
Fair value as at end |  | ¥ 80,270

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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