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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |
Contract revenue | $ 6 | $ 1,018
Type of Revenue [Extensible List] | cbio:ContractMember | cbio:ContractMember
Operating expenses: |  |
Research and development | $ 21,474 | $ 12,847
General and administrative | 12,354 | 9,993
Total operating expenses | 33,828 | 22,840
Loss from operations | (33,822) | (21,822)
Interest and other income, net | 3,767 | 261
Net loss | (30,055) | (21,561)
Deemed dividend for convertible preferred stock beneficial conversion feature |  | (3,951)
Net loss attributable to common stockholders | $ (30,055) | $ (25,512)
Net loss per share attributable to common stockholders, basic and diluted | $ (2.68) | $ (7.45)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted | 11,213,884 | 3,423,901

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