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Consolidated Statements of Stockholders' Equity (Parenthetical) | 12 Months Ended
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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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration