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OPERATING SEGMENT INFORMATION (Tables)
3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information The tables below provide information regarding revenue, adjusted gross profit, and depreciation expense by reportable segment for the three months ended March 31, 2023 and 2022 (in thousands):
Three months ended
March 31,
2023
March 31,
2022
Segment revenue:
  Cloud and Edge$114,480 $109,806 
  IP Optical Networks71,679 63,392 
    Revenue$186,159 $173,198 

Three months ended
March 31,
2023
March 31,
2022
Segment adjusted gross profit:
  Cloud and Edge$69,975 $68,293 
  IP Optical Networks19,500 18,609 
    Total segment adjusted gross profit89,475 86,902 
Stock-based compensation expense(684)(580)
Amortization of acquired technology(7,389)(8,267)
      Gross profit$81,402 $78,055 

Three months ended
March 31,
2023
March 31,
2022
Segment depreciation expense:
  Cloud and Edge$2,499 $2,715 
  IP Optical Networks1,011 1,170 
    Depreciation expense$3,510 $3,885