v3.26.1
OPERATING SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Jun. 30, 2025
USD ($)
OPERATING SEGMENT INFORMATION        
Number of operating segments | segment     2  
Number of reportable segments | segment     2  
Revenue $ 192,340 $ 220,583 $ 354,946 $ 401,862
Reconciliation of segment adjusted gross profit to gross profit and loss before income taxes        
Gross profit 90,343 109,307 160,034 191,677
Research and development expense 44,858 44,696 89,303 88,264
Sales and marketing expense 33,124 32,536 65,393 64,324
General and administrative expense 14,643 16,630 31,621 31,758
Amortization of acquired intangible assets 5,495 5,975 11,151 12,130
Acquisition-, disposal- and integration-related expense   3,898   3,898
Restructuring and related 4,442 1,346 6,480 6,687
Interest expense, net 10,685 10,977 20,441 21,477
Other expense (income), net 2,258 2,159 1,744 (970)
Loss before income taxes (25,162) (8,910) (66,099) (35,891)
Segment depreciation expense:        
Depreciation expense 4,671 4,288 9,131 7,757
Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 192,340 220,583 354,946 401,862
Total segment adjusted gross profit 94,911 114,815 169,368 202,925
Reconciling items        
Reconciliation of segment adjusted gross profit to gross profit and loss before income taxes        
Stock-based compensation expense (214) (231) (418) (583)
Amortization of acquired technology (4,354) (5,277) (8,916) (10,665)
Cloud and Edge        
Segment depreciation expense:        
Depreciation expense 2,564 2,399 4,886 4,752
Cloud and Edge | Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 110,505 137,048 210,017 244,639
Total segment adjusted gross profit 66,069 84,854 122,591 152,150
IP Optical Networks        
Segment depreciation expense:        
Depreciation expense 2,107 1,889 4,245 3,005
IP Optical Networks | Operating segment        
OPERATING SEGMENT INFORMATION        
Revenue 81,835 83,535 144,929 157,223
Total segment adjusted gross profit $ 28,842 $ 29,961 $ 46,777 $ 50,775