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Organization and Significant Accounting Policies - Organization (Details)	Mar. 31, 2023 product
Organization and Significant Accounting Policies
Product pipeline, number of product candidates	3

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- Definition

Represents the number of drug candidates in the product pipeline.

+ References

No definition available.

+ Details

Name:	chrs_ProductPipelineNumberOfDrugCandidates
Namespace Prefix:	chrs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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