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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |
Contract revenue |  | $ 6
Type of Revenue [Extensible List] | cbio:ContractMember | cbio:ContractMember
Operating expenses: |  |
Research and development | $ 43,859 | $ 21,474
General and administrative | 13,418 | 12,354
Total operating expenses | 57,277 | 33,828
Loss from operations | (57,277) | (33,822)
Interest and other income, net | 2,099 | 3,767
Net loss | $ (55,178) | $ (30,055)
Net loss per share attributable to common stockholders, basic and diluted | $ (4.60) | $ (2.68)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted | 12,004,489 | 11,213,884

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