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OPERATING SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
OPERATING SEGMENT INFORMATION        
Number of operating segments | segment     2  
Number of reportable segments | segment     2  
Revenue $ 215,371 $ 210,238 $ 617,233 $ 582,522
Gross profit 107,966 109,617 299,643 299,439
Research and development expense 45,894 45,645 134,158 134,897
Sales and marketing expense 33,063 33,060 97,387 100,760
General and administrative expense 16,368 21,588 48,126 51,680
Amortization of acquired intangible assets 5,933 6,457 18,063 19,671
Acquisition-, disposal- and integration-related expense 439   4,337  
Restructuring and related 3,506 3,794 10,193 8,779
Interest expense, net 11,606 11,952 33,083 21,818
Other expense (income), net 134 (1,056) (836) 15,960
Loss before income taxes (8,977) (11,823) (44,868) (54,126)
Segment depreciation expense:        
Depreciation expense 4,425 3,361 12,182 10,131
Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 215,371 210,238 617,233 582,522
Total segment adjusted gross profit 113,192 116,295 316,117 320,116
Reconciling items        
OPERATING SEGMENT INFORMATION        
Stock-based compensation expense (169) (355) (752) (1,271)
Amortization of acquired technology (5,057) (6,323) (15,722) (19,406)
Cloud and Edge        
Segment depreciation expense:        
Depreciation expense 2,399 2,324 7,151 6,981
Cloud and Edge | Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 124,438 128,078 369,077 340,302
Total segment adjusted gross profit 77,387 86,661 229,537 226,726
IP Optical Networks        
Segment depreciation expense:        
Depreciation expense 2,026 1,037 5,031 3,150
IP Optical Networks | Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 90,933 82,160 248,156 242,220
Total segment adjusted gross profit $ 35,805 $ 29,634 $ 86,580 $ 93,390