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LEASES - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Zix Corporation and Bricata Inc    
Lessee, Lease, Description [Line Items]    
ROU assets acquired   $ 9.7
Minimum    
Lessee, Lease, Description [Line Items]    
Operating leases, term of contract 1 year  
Operating leases, term of extension option 3 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating leases, term of contract 10 years  
Operating leases, term of extension option 5 years  
Land    
Lessee, Lease, Description [Line Items]    
Operating leases, term of contract 49 years  
Operating leases, term of extension option 49 years