Inventory - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Inventory Disclosure [Abstract]
Decrease in inventory due to additional reserves	$ 4,230	$ (6)

Change in provision for excess and obsolete inventory.

No definition available.

Name:	casa_ChangeInProvisionForExcessAndObsoleteInventory
Namespace Prefix:	casa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration