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Statutory Reserves and Restricted Net Assets - (Details) - CNY (¥) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Restrictions for Consolidated and Unconsolidated Subsidiaries [Abstract] |  |
Required minimum percentage of annual appropriations | 10.00% |
Statutory threshold percentage of the reserve fund to the registered capital of the respective company, above which the appropriation is not required | 50.00% |
Statutory reserves | ¥ 0 | ¥ 0
Restricted net assets | ¥ 3,121,808,000 |

X
- Definition The percent of minimum percentage of statutory after-tax profit required to be appropriated for the Group's entities in the PRC until the reserve balance reaches a specified percentage of registered capital. + References No definition available. + Details
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Namespace Prefix: | hsai_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the statutory requirement ratio of the reserve fund to statutory registered capital after which mandatory contributions to the reserve fund are no longer required for the Group's entities in the PRC . + References No definition available. + Details
Name: | hsai_AppropriationOfAfterTaxProfitToReserveFundStatutoryRequirementLimitRegisteredCapitalPercentage
Namespace Prefix: | hsai_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of statutory reserve balances. + References No definition available. + Details
Name: | hsai_StatutoryReserves
Namespace Prefix: | hsai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(3)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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