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Debt Obligations - Capped Call Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 | Sep. 30, 2022 | Apr. 14, 2020
Option Indexed to Issuer's Equity [Line Items] |  |  |
Closing stock, price per share |  | $ 9.61 | $ 14.815
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. | $ 25.9263 |  |
Percentage of cap price | 75.00% |  |
Closing stock, price per share |  |  | $ 14.815

X
- Definition Represents the cap price of the cap call transactions (per share). + References No definition available. + Details
Name: | chrs_CapPriceOfCapCallTransactions
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
Name: | us-gaap_OptionIndexedToIssuersEquityLineItems
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
Name: | us-gaap_OptionIndexedToIssuersEquityEquityAxis=us-gaap_CallOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |