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OPERATING SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | segment 2  
Segment Reporting Information [Line Items]    
Total revenue $ 186,159 $ 173,198
Total segment adjusted gross profit 89,475 86,902
Stock-based compensation expense (684) (580)
Amortization of acquired technology (7,389) (8,267)
Gross profit 81,402 78,055
Segment depreciation expense:    
Depreciation expense 3,510 3,885
Cloud and Edge    
Segment Reporting Information [Line Items]    
Total revenue 114,480 109,806
Total segment adjusted gross profit 69,975 68,293
Segment depreciation expense:    
Depreciation expense 2,499 2,715
IP Optical Networks    
Segment Reporting Information [Line Items]    
Total revenue 71,679 63,392
Total segment adjusted gross profit 19,500 18,609
Segment depreciation expense:    
Depreciation expense $ 1,011 $ 1,170