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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
U.S. Pan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan, employer matching contribution, percent of match | 100.00% |
Defined contribution plan, maximum annual contributions per employee, percent | 4.00% |
Defined contribution plan employers matching contribution vesting period | 2 years |
Defined contribution plan, employer discretionary contribution amount | $ 0.5 | $ 0.6
UK Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan, employer matching contribution, percent of match | 5.00% |
Defined contribution plan, maximum annual contributions per employee, percent | 7.00% |
Defined contribution plan, employer discretionary contribution amount | $ 0.1 | $ 0.1
Defined contribution plan, employee matching contribution, percent of match | 3.00% |
Defined contribution plan, employer matching contribution, percent of employees' gross pay | 1.00% |

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- Definition Defined contribution plan employer matching contribution percent of match. + References No definition available. + Details
Name: | cmbm_DefinedContributionPlanEmployeeContributionPercentOfMatch
Namespace Prefix: | cmbm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined contribution plan employers matching contribution vesting period. + References No definition available. + Details
Name: | cmbm_DefinedContributionPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix: | cmbm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |