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OPERATING SEGMENT INFORMATION (Tables) | 12 Months Ended
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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 + Details
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