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v3.21.1

Subsequent Event - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021
Subsequent Event [Line Items] |  |
Lease expiration date |  | Apr. 30, 2023
Lease Lab and Office Space | Subsequent Event | Sublease Arrangement |  |
Subsequent Event [Line Items] |  |
Sublease cost | $ 0.3 |
Operating leases, monthly payment | $ 0.1 |
Percentage of increase in lease payment | 3.50% |
Lease term | 1 year |
Operating lease, option to extend | The lease arrangement provides an option to extend for an additional six months beyond the initial lease term |
Lease expiration date | Apr. 30, 2022 |

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- Definition Operating leases monthly payment. + References No definition available. + Details
Name: | cbio_OperatingLeasesMonthlyPayment
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage of increase in lease payment. + References No definition available. + Details
Name: | cbio_PercentageOfIncreaseInLeasePayment
Namespace Prefix: | cbio_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Sublease cost. + References No definition available. + Details
Name: | cbio_SubleaseCost
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseOptionToExtend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cbio_LeaseLabAndOfficeSpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=cbio_SubleaseArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |