v3.26.1
OPERATING SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
OPERATING SEGMENT INFORMATION    
Number of operating segments | segment 2  
Number of reportable segments | segment 2  
Revenue $ 162,606 $ 181,279
Reconciliation of segment adjusted gross profit to gross profit and loss before income taxes    
Gross profit 69,691 82,370
Research and development expense 44,445 43,568
Sales and marketing expense 32,269 31,788
General and administrative expense 16,978 15,128
Amortization of acquired intangible assets 5,656 6,155
Restructuring and related 2,038 5,341
Interest expense, net 9,756 10,500
Other income, net (514) (3,129)
Loss before income taxes (40,937) (26,981)
Segment depreciation expense:    
Depreciation expense 4,460 3,469
Operating segment    
OPERATING SEGMENT INFORMATION    
Revenue 162,606 181,279
Total segment adjusted gross profit 74,457 88,110
Reconciling items    
Reconciliation of segment adjusted gross profit to gross profit and loss before income taxes    
Stock-based compensation expense (204) (352)
Amortization of acquired technology (4,562) (5,388)
Cloud and Edge    
Segment depreciation expense:    
Depreciation expense 2,322 2,353
Cloud and Edge | Operating segment    
OPERATING SEGMENT INFORMATION    
Revenue 99,512 107,591
Total segment adjusted gross profit 56,522 67,296
IP Optical Networks    
Segment depreciation expense:    
Depreciation expense 2,138 1,116
IP Optical Networks | Operating segment    
OPERATING SEGMENT INFORMATION    
Revenue 63,094 73,688
Total segment adjusted gross profit $ 17,935 $ 20,814