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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: