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Fair Value Measurements and Financial Instruments (Details)	Mar. 02, 2021 USD ($)
UHP
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Earn-out payment	$ 9,000,000

X

- Definition

Business Acquisition, Earn-Out Payment

+ References

No definition available.

+ Details

Name:	cmtl_BusinessAcquisitionEarnOutPayment
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cmtl_UHPNetworksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: