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Condensed Consolidated Statements of Shareholders' (Deficit) Equity (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Statement Of Stockholders Equity [Abstract]
Share issuance costs	$ 7,866

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- Definition

Stock issuance costs.

+ References

No definition available.

+ Details

Name:	cmbm_StockIssuanceCosts
Namespace Prefix:	cmbm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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