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Leases - Components of lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases
Amortization of right-of-use assets	$ 1,228	$ 707	$ 368
Interest on lease liabilities	166	82	57
Total finance lease cost	1,394	789	425
Operating lease cost	3,154	3,066	3,126
Total lease cost	$ 4,548	$ 3,855	$ 3,551

X

- Definition

Amount of finance lease cost incurred during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	chrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest expense on finance lease liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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+ Details

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Balance Type:	debit
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X

- Definition

Amount of amortization expense attributable to right-of-use asset from finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
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-SubTopic 20
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X

- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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