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OPERATING SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
OPERATING SEGMENT INFORMATION        
Number of reportable segments | segment     2  
Total revenue $ 210,238 $ 203,161 $ 582,522 $ 599,938
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
Segment depreciation expense:        
Depreciation expense 3,361 3,544 10,131 10,603
Cloud and Edge        
OPERATING SEGMENT INFORMATION        
Total revenue 128,078 115,765 340,302 355,501
Total segment adjusted gross profit 86,661 78,455 226,726 231,729
Segment depreciation expense:        
Depreciation expense 2,324 2,426 6,981 7,402
IP Optical Networks        
OPERATING SEGMENT INFORMATION        
Total revenue 82,160 87,396 242,220 244,437
Total segment adjusted gross profit 29,634 32,862 93,390 78,613
Segment depreciation expense:        
Depreciation expense $ 1,037 $ 1,118 $ 3,150 $ 3,201