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Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Inventory
Finished goods	$ 4,200	$ 2,600
Inventory, non-current	0	462
Prepayment made for manufacturing services	6,653	$ 11,030
Prepayments made to a CMO for manufacturing services	300
Prepayments made to a CMO For Other Research And Development Pipeline Program	$ 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 before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InventoryFinishedGoods
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant