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Organization and Significant Accounting Policies - Organization (Details) $ in Thousands	Sep. 30, 2022 USD ($) product	Dec. 31, 2021 USD ($)
Organization and Summary of Significant Accounting Policies
Product pipeline, number of product candidates | product	3
Investments in marketable securities | $	$ 0	$ 0

X

- Definition

Represents the number of drug candidates in the product pipeline.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant