Number of customers.

No definition available.

Name:	cmbm_NumberOfCustomers
Namespace Prefix:	cmbm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue from contract with customer.

+ References

No definition available.

+ Details

Name:	cmbm_RevenueFromContractWithCustomerLineItems
Namespace Prefix:	cmbm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Trade accounts receivable due period.

+ References

No definition available.

+ Details

Name:	cmbm_TradeAccountsReceivableDuePeriod
Namespace Prefix:	cmbm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
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-Paragraph 5
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+ Details

Name:	us-gaap_RevenuePracticalExpedientIncrementalCostOfObtainingContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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+ Details

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Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=cmbm_CustomerAMember
Namespace Prefix:
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Revenues from Contracts with Customers - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Customer	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Customer
Revenue From Contract With Customer [Line Items]
Deferred revenue	$ 14.1		$ 14.1		$ 12.2
Revenue remaining performance obligation	7.3		7.3		$ 6.9
Revenue recognized	$ 2.0	$ 1.9	$ 4.2	$ 3.6
Revenue practical expedient, incremental cost of obtaining contract [true/false]			true
Minimum
Revenue From Contract With Customer [Line Items]
Collection period for trade accounts receivable			30 days
Maximum
Revenue From Contract With Customer [Line Items]
Collection period for trade accounts receivable			60 days
Customer Concentration Risk \| Accounts Receivables
Revenue From Contract With Customer [Line Items]
Number of customers \| Customer			1		1
Customer Concentration Risk \| Accounts Receivables \| Customer A
Revenue From Contract With Customer [Line Items]
Concentration risk, percentage			10.00%		10.00%