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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
REVENUE RECOGNITION
Total revenue	$ 844,556	$ 833,881	$ 826,339
United States
REVENUE RECOGNITION
Total revenue	402,957	395,984	344,415
Europe, Middle East and Africa
REVENUE RECOGNITION
Total revenue	214,151	234,679	261,901
Asia Pacific
REVENUE RECOGNITION
Total revenue	180,985	151,570	167,083
Other
REVENUE RECOGNITION
Total revenue	46,463	51,648	52,940
Product revenue
REVENUE RECOGNITION
Total revenue	434,587	447,229	445,150
Product revenue | Cloud and Edge
REVENUE RECOGNITION
Total revenue	198,163	211,001	184,730
Product revenue | IP Optical Networks
REVENUE RECOGNITION
Total revenue	236,424	236,228	260,420
Product revenue | Sales to enterprise customers
REVENUE RECOGNITION
Total revenue	148,758	176,064	143,853
Product revenue | Sales to service provider customers
REVENUE RECOGNITION
Total revenue	285,829	271,165	301,297
Product revenue | Indirect sales through channel partner program
REVENUE RECOGNITION
Total revenue	134,154	170,426	157,495
Product revenue | Direct sales
REVENUE RECOGNITION
Total revenue	300,433	276,803	287,655
Product revenue | United States
REVENUE RECOGNITION
Total revenue	179,660	201,340	161,945
Product revenue | Europe, Middle East and Africa
REVENUE RECOGNITION
Total revenue	111,235	129,824	151,938
Product revenue | Asia Pacific
REVENUE RECOGNITION
Total revenue	129,298	100,766	115,923
Product revenue | Other
REVENUE RECOGNITION
Total revenue	14,394	15,299	15,344
Service
REVENUE RECOGNITION
Total revenue	409,969	386,652	381,189
Service revenue (maintenance)
REVENUE RECOGNITION
Total revenue	270,551	274,582	279,652
Service revenue (maintenance) | Cloud and Edge
REVENUE RECOGNITION
Total revenue	206,604	212,988	219,939
Service revenue (maintenance) | IP Optical Networks
REVENUE RECOGNITION
Total revenue	63,947	61,594	59,713
Service revenue (maintenance) | United States
REVENUE RECOGNITION
Total revenue	136,452	133,182	133,737
Service revenue (maintenance) | Europe, Middle East and Africa
REVENUE RECOGNITION
Total revenue	69,594	71,856	75,478
Service revenue (maintenance) | Asia Pacific
REVENUE RECOGNITION
Total revenue	38,474	39,863	39,891
Service revenue (maintenance) | Other
REVENUE RECOGNITION
Total revenue	26,031	29,681	30,546
Service revenue (professional services)
REVENUE RECOGNITION
Total revenue	139,418	112,070	101,537
Service revenue (professional services) | Cloud and Edge
REVENUE RECOGNITION
Total revenue	106,663	81,168	72,979
Service revenue (professional services) | IP Optical Networks
REVENUE RECOGNITION
Total revenue	32,755	30,902	28,558
Service revenue (professional services) | United States
REVENUE RECOGNITION
Total revenue	86,845	61,462	48,733
Service revenue (professional services) | Europe, Middle East and Africa
REVENUE RECOGNITION
Total revenue	33,322	32,999	34,485
Service revenue (professional services) | Asia Pacific
REVENUE RECOGNITION
Total revenue	13,213	10,941	11,269
Service revenue (professional services) | Other
REVENUE RECOGNITION
Total revenue	$ 6,038	$ 6,668	$ 7,050

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