INTANGIBLE ASSETS AND GOODWILL - Narrative (Details)	3 Months Ended	12 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment		2
Goodwill	$ 300,892,000	$ 300,892,000	$ 300,892,000	$ 416,892,000
Impairment of goodwill		$ 0	116,000,000	0
Number of reportable operating segments \| segment		2
Cloud and Edge
Goodwill [Line Items]
Goodwill	224,896,000	$ 224,896,000	224,896,000	224,896,000
Impairment of goodwill	0
IP Optical Networks
Goodwill [Line Items]
Goodwill	75,996,000	$ 75,996,000	$ 75,996,000	$ 191,996,000
Impairment of goodwill	$ 116,000,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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