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Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2018 shares
Statement Of Stockholders Equity [Abstract]
Stock grants in lieu of cash compoensation	6,790

X

- Definition

Stock grants elected to receive in lieu of cash compensation for board of director fees.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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