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Revenue (Details)	Mar. 31, 2021 USD ($)
Revenue Disclosure [Abstract]
Contract liability	$ 352,211

Amount of prior period contract liability balance.

No definition available.

Name:	coms_ContractLiability
Namespace Prefix:	coms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	coms_RevenueDisclosureAbstract
Namespace Prefix:	coms_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration