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OPERATING SEGMENT INFORMATION (Tables) | 3 Months Ended
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Mar. 31, 2022
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information | The tables below provide information regarding revenue, adjusted gross profit, and depreciation expense by reportable segment for the three months ended March 31, 2022 and 2021 (in thousands):
|  |  | Three months ended
|  |  |  |  | March 31, 2022 |  | March 31, 2021
Segment revenue: |  |  |  |  |  |  |
Cloud and Edge |  |  |  |  | $ | 109,806 |  |  | $ | 125,422 |
IP Optical Networks |  |  |  |  | 63,392 |  |  | 67,350 |
Revenue |  |  |  |  | $ | 173,198 |  |  | $ | 192,772 |
|  |  | Three months ended
|  |  |  |  | March 31, 2022 |  | March 31, 2021
Segment adjusted gross profit: |  |  |  |  |  |  |
Cloud and Edge |  |  |  |  | $ | 68,293 |  |  | $ | 84,335 |
IP Optical Networks |  |  |  |  | 18,609 |  |  | 26,474 |
Total segment adjusted gross profit |  |  |  |  | 86,902 |  |  | 110,809 |
Stock-based compensation expense |  |  |  |  | (580) |  |  | (262) |
Amortization of acquired technology |  |  |  |  | (8,267) |  |  | (10,061) |
Gross profit |  |  |  |  | $ | 78,055 |  |  | $ | 100,486 |
|  |  | Three months ended
|  |  |  |  | March 31, 2022 |  | March 31, 2021
Segment depreciation expense: |  |  |  |  |  |  |
Cloud and Edge |  |  |  |  | $ | 2,715 |  |  | $ | 3,137 |
IP Optical Networks |  |  |  |  | 1,170 |  |  | 1,089 |
Depreciation expense |  |  |  |  | $ | 3,885 |  |  | $ | 4,226 |

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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 http://asc.fasb.org/extlink&oid=123359005&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 http://asc.fasb.org/extlink&oid=123359005&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 http://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 http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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