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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