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Condensed Consolidated Statements of Shareholders' (Deficit) Equity (Parenthetical) $ in Thousands | 9 Months Ended
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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
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Namespace Prefix: | cmbm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration