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OPERATING SEGMENT INFORMATION (Tables)
3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 (in thousands):
Three months ended
March 31,
2022
March 31,
2021
Segment revenue:
  Cloud and Edge$109,806 $125,422 
  IP Optical Networks63,392 67,350 
    Revenue$173,198 $192,772 

Three months ended
March 31,
2022
March 31,
2021
Segment adjusted gross profit:
  Cloud and Edge$68,293 $84,335 
  IP Optical Networks18,609 26,474 
    Total segment adjusted gross profit86,902 110,809 
Stock-based compensation expense(580)(262)
Amortization of acquired technology(8,267)(10,061)
      Gross profit$78,055 $100,486 

Three months ended
March 31,
2022
March 31,
2021
Segment depreciation expense:
  Cloud and Edge$2,715 $3,137 
  IP Optical Networks1,170 1,089 
    Depreciation expense$3,885 $4,226