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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

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- Definition Prepaid Manufacturing current. + References No definition available. + Details
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Namespace Prefix: | chrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents prepayments made to a CMO for manufacturing services. + References No definition available. + Details
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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

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
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