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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Contract revenue		$ 318	$ 6	$ 700
Type of Revenue [Extensible List]	cbio:ContractMember	cbio:ContractMember	cbio:ContractMember	cbio:ContractMember
Operating expenses:
Research and development	$ 5,575	$ 3,805	$ 13,235	$ 9,286
General and administrative	2,770	2,391	8,909	7,407
Total operating expenses	8,345	6,196	22,144	16,693
Loss from operations	(8,345)	(5,878)	(22,138)	(15,993)
Interest and other income, net	651	85	2,920	185
Net loss	(7,694)	(5,793)	(19,218)	(15,808)
Deemed dividend for convertible preferred stock beneficial conversion feature				(3,951)
Net loss attributable to common stockholders	$ (7,694)	$ (5,793)	$ (19,218)	$ (19,759)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.64)	$ (1.34)	$ (1.75)	$ (6.49)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted	11,942,729	4,310,561	10,967,750	3,043,919

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