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Commitments and Contingencies - Additional Information (Detail) - AGC Biologics, Inc - Marzeptacog Alfa Activated and Dalcinonacog Alfa $ in Millions	Sep. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Clinical trials	$ 12.4
Contractual obligation payments	$ 5.4

X

- Definition

Clinical trials.

+ References

No definition available.

+ Details

Name:	cbio_ClinicalTrials
Namespace Prefix:	cbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Commitments and contingencies disclosure.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbio_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=cbio_AGCBiologicsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cbio_MarzeptacogAlfaActivatedAndDalcinonacogAlfaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: