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OPERATING SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2022

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The tables below provide revenue, adjusted gross profit and depreciation expense by reportable segment for the years ended December 31, 2022, 2021 and 2020 (in thousands):

			Year ended December 31,
Revenue			2022						2021						2020
Segment revenue:
Cloud and Edge			$	508,137					$	556,656					$	583,270
IP Optical Networks			311,623						288,301						260,525
Total revenue			$	819,760					$	844,957					$	843,795

			Year ended December 31,
Adjusted gross profit			2022						2021						2020
Segment adjusted gross profit:
Cloud and Edge			$	330,395					$	370,504					$	385,137
IP Optical Networks			104,711						114,496						110,845
Total segment adjusted gross profit			435,106						485,000						495,982
Stock-based compensation expense			(2,628)						(1,997)						(875)
Amortization of acquired technology			(31,542)						(38,343)						(42,290)
Acquisition-related inventory and facilities adjustments			—						—						(2,000)
Gross profit			$	400,936					$	444,660					$	450,817

			Year ended December 31,
Depreciation expense			2022						2021						2020
Segment depreciation expense:
Cloud and Edge			$	10,758					$	12,269					$	12,111
IP Optical Networks			4,537						4,693						5,077
Total depreciation expense			$	15,295					$	16,962					$	17,188

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

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