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Debt Obligations - Capped Call Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Apr. 30, 2020	Apr. 30, 2020	Dec. 30, 2022	Apr. 14, 2020
Option Indexed to Issuer's Equity [Line Items]
Closing stock, price per share			$ 7.92	$ 14.82
Capped Call Transactions in connection with the 2026 Convertible Notes
Option Indexed to Issuer's Equity [Line Items]
Payment for capped call transactions		$ 18.2
Initial cap price of capped call transactions.	$ 25.93
Percentage of cap price		75.00%

X

- Definition

Represents the cap price of the cap call transactions (per share).

+ References

No definition available.

+ Details

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Namespace Prefix:	chrs_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of payment made for entering into capped call transactions.

+ References

No definition available.

+ Details

Name:	chrs_PaymentForCappedCallTransactions
Namespace Prefix:	chrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the percentage of premium on cap price.

+ References

No definition available.

+ Details

Name:	chrs_PercentageOfCapPriceCappedCallTransactions
Namespace Prefix:	chrs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: