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REVENUE AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
ASU 2014-09      
Disaggregation of Revenue [Line Items]      
Total revenue $ 677,953 $ 565,541 $ 428,685
Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 633,816 508,180 407,335
Goods and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 44,137 57,361 21,350
Telecom | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 301,309 188,405 96,935
Telecom | Goods and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 29,203 46,433 12,154
International Telecom | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 332,507 319,357 305,844
International Telecom | Goods and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue $ 14,934 10,928 9,196
Solar | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue   $ 418 $ 4,556