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OPERATING SEGMENT INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2024
OPERATING SEGMENT INFORMATION |
Schedule of segment reporting information | The tables below provide revenue, adjusted gross profit and depreciation expense by reportable segment for the three and nine months ended September 30, 2024 and 2023 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Segment revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cloud and Edge |  | $ | 128,078 |  | $ | 115,765 |  | $ | 340,302 |  | $ | 355,501
IP Optical Networks |  | ​ | 82,160 |  | ​ | 87,396 |  | ​ | 242,220 |  | ​ | 244,437
Revenue |  | $ | 210,238 |  | $ | 203,161 |  | $ | 582,522 |  | $ | 599,938
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Segment adjusted gross profit: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cloud and Edge |  | $ | 86,661 |  | $ | 78,455 |  | $ | 226,726 |  | $ | 231,729
IP Optical Networks |  | ​ | 29,634 |  | ​ | 32,862 |  | ​ | 93,390 |  | ​ | 78,613
Total segment adjusted gross profit |  | ​ | 116,295 |  | ​ | 111,317 |  | ​ | 320,116 |  | ​ | 310,342
Stock-based compensation expense | ​ | ​ | (355) | ​ | ​ | (657) | ​ | ​ | (1,271) | ​ | ​ | (1,982)
Amortization of acquired technology |  | ​ | (6,323) |  | ​ | (7,157) |  | ​ | (19,406) |  | ​ | (21,985)
Gross profit |  | $ | 109,617 |  | $ | 103,503 |  | $ | 299,439 |  | $ | 286,375
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Segment depreciation expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cloud and Edge |  | $ | 2,324 |  | $ | 2,426 |  | $ | 6,981 |  | $ | 7,402
IP Optical Networks |  | ​ | 1,037 |  | ​ | 1,118 |  | ​ | 3,150 |  | ​ | 3,201
Depreciation expense |  | $ | 3,361 |  | $ | 3,544 |  | $ | 10,131 |  | $ | 10,603
​

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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 -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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