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Detail of Interest and Other Income/(Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income And Expenses [Abstract]
Interest income	$ 652	$ 85	$ 1,539	$ 185
Loss on disposal of property and equipment			(116)
Other income, net	(1)		1,497
Total interest and other income, net	$ 651	$ 85	$ 2,920	$ 185

X

- Definition

Interest and other income (expense), net.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbio_
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X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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- References

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- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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