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Subsequent Events (Details) € in Millions | Jan. 09, 2023 EUR (€)
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Term Sheet Agreement | Klinge Biopharma | Subsequent Event |
Subsequent Event [Line Items] |
Collaboration Agreement, upfront amount paid | € 30

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- Definition Represents costs associated to a collaboration agreement. + References No definition available. + Details
Name: | chrs_CollaborationCosts
Namespace Prefix: | chrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=chrs_TermSheetAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=chrs_KlingeBiopharmaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |