XML 73 R56.htm IDEA: XBRL DOCUMENT
v3.20.4

Income Taxes - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2007
Income Tax [Line Items] |  |  |  |  |
Increase (decrease) in valuation allowance |  | $ (6,900,000) | $ 17,200,000 |  |
Gross federal R&D tax credit-related deferred tax assets derecognized |  | 15,200,000 |  |  |
Unrecognized tax benefit |  | 2,955,000 | 1,871,000 | $ 1,573,000 |
Tax-related penalties or interest recognized |  | 0 | 0 |  |
Uncertain tax positions |  | 0 | $ 0 |  |
Federal Income Tax |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 140,400,000 |  |  | $ 156,300,000
Net operating loss carryforwards expiration year |  | 2037 |  |  |
Net operating loss carryforwards having indefinite life |  | $ 132,900,000 |  |  |
Tax credit carryforwards available to offset future federal tax liabilities |  | $ 5,000,000.0 |  |  |
Credit carryforward, expire period |  | Dec. 31, 2040 |  |  |
Net operating loss carryforward, derecognized |  | $ 32,800,000 |  |  |
State Income Tax |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 8,000,000.0 |  |  |
Net operating loss carryforwards expiration year |  | 2032 |  |  |
Tax credit carryforwards available to offset future federal tax liabilities |  | $ 6,800,000 |  |  |
CALIFORNIA |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 70,800,000 |  |  |
Net operating loss carryforward, derecognized |  | $ 0 |  |  |
Maximum amount of tax offset per year | $ 5,000,000 |  |  |  |
Required Minimum Taxable Income | $ 1,000,000 |  |  |  |

X
- Definition Deferred tax assets state net operating loss carry forwards. + References No definition available. + Details
Name: | cbio_DeferredTaxAssetsStateNetOperatingLossCarryForwards
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Income Tax. + References No definition available. + Details
Name: | cbio_IncomeTaxLineItems
Namespace Prefix: | cbio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount of tax offset per year. + References No definition available. + Details
Name: | cbio_MaximumAmountOfTaxOffsetPerYear
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating loss carryforwards expiration year. + References No definition available. + Details
Name: | cbio_OperatingLossCarryforwardsExpirationYear
Namespace Prefix: | cbio_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating loss carryforwards with indefinite life. + References No definition available. + Details
Name: | cbio_OperatingLossCarryforwardsWithIndefiniteLife
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The minimum taxable income required to support realizing the company's. + References No definition available. + Details
Name: | cbio_RequiredMinimumTaxableIncome
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Research and development tax credit carry forwards derecognized. + References No definition available. + Details
Name: | cbio_ResearchAndDevelopmentTaxCreditCarryForwardsDerecognized
Namespace Prefix: | cbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount recognized for uncertainty in income taxes classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LiabilityForUncertainTaxPositionsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Expiration date of the tax credit carryforward, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardExpirationDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |