XML 63 R51.htm IDEA: XBRL DOCUMENT 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

X

- 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

X

- 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

X

- Definition

Sublease cost.

+ References

No definition available.

+ Details

Name:	cbio_SubleaseCost
Namespace Prefix:	cbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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