Revenue (Details) - Schedule of timing of revenue recognition - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Timing of revenue recognition:
Services and products transferred at a point in time	$ 3,979	$ 1,941	$ 9,348	$ 7,056
Services and products transferred over time	136	77	464	457
Total revenue	$ 4,115	$ 2,018	$ 9,812	$ 7,513

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenues, and sales and trading gain (loss).

No definition available.

Name:	coms_TotalRevenue
Namespace Prefix:	coms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration