Revenue (Details) - Schedule of timing of revenue recognition - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Timing of revenue recognition:
Services and products transferred at a point in time	$ 3,473	$ 2,953	$ 5,370	$ 5,115
Services and products transferred over time	138	57	328	380
Total revenue	$ 3,611	$ 3,010	$ 5,698	$ 5,495

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