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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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Period Type:	duration

X

- 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

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Namespace Prefix:	hsai_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of statutory reserve balances.

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No definition available.

+ Details

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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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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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