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v3.22.1

OPERATING SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($)
Segment Reporting [Abstract] |  |
Number of reportable operating segments | segment | 2 |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 173,198 | $ 192,772
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
Segment depreciation expense: |  |
Depreciation expense | 3,885 | 4,226
Cloud and Edge |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 109,806 | 125,422
Total segment adjusted gross profit | 68,293 | 84,335
Segment depreciation expense: |  |
Depreciation expense | 2,715 | 3,137
IP Optical Networks |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 63,392 | 67,350
Total segment adjusted gross profit | 18,609 | 26,474
Segment depreciation expense: |  |
Depreciation expense | $ 1,170 | $ 1,089

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