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Inventory - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2025	Dec. 31, 2024
Inventory
Inventory write-downs	$ 2,481
Prepayment made for manufacturing services		$ 8,048	$ 6,653
Prepayments made to a CMO for manufacturing services		3,800	300
Prepayments made to a CMO For Other Research And Development Pipeline Program		$ 4,300	$ 6,400

X

- Definition

Prepaid Manufacturing current.

+ References

No definition available.

+ Details

Name:	chrs_PrepaidManufacturingExpenseCurrent
Namespace Prefix:	chrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents prepayments made to a CMO for manufacturing services.

+ References

No definition available.

+ Details

Name:	chrs_PrepaymentsMadeToCmoForManufacturingServices
Namespace Prefix:	chrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents prepayments made to a CMO for other research and development program.

+ References

No definition available.

+ Details

Name:	chrs_PrepaymentsMadeToCmoForOtherResearchAndDevelopmentPipelineProgram
Namespace Prefix:	chrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration