REVENUE Remaining Performance Obligations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Revenue Arrangement [Line Items]
Revenue, Performance Obligation, Description of Timing	six years
Remaining Performance Obligation	$ 40,700
Unbilled Receivables, Not Billable	32,000
Products
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	4,364
Subscription services
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	7,380
Maintenance contracts
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	66,676
Implied PCS
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	6,400
Implied PCS | Forecast [Member]
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation		$ 400	$ 600	$ 1,000	$ 1,500	$ 2,200	$ 700
Professional services, training and other
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	$ 1,947