Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense on property and equipment	$ 1,341	$ 1,958	$ 2,720	$ 4,040

Depreciation and amortization expense on property and equipment.

No definition available.

Name:	casa_DepreciationAndAmortizationExpenseOnPropertyAndEquipment
Namespace Prefix:	casa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration