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v3.20.2

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Vector Capital Management L.P. |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and oversight fees | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.2

X
- Definition Management and oversight fees related party. + References No definition available. + Details
Name: | cmbm_ManagementAndOversightFeesRelatedParty
Namespace Prefix: | cmbm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cmbm_VectorCapitalManagementLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |