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Property, Plant and Equipment - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total cost $ 126,843 $ 97,725
Less—accumulated depreciation (58,576) (46,080)
Property, plant and equipment, net 68,267 51,645
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total cost 2,179 2,341
Computer and office equipment    
Property, Plant and Equipment [Line Items]    
Total cost 4,885 4,077
Telecommunications equipment    
Property, Plant and Equipment [Line Items]    
Total cost 68,596 60,651
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total cost 6,260 6,285
Software    
Property, Plant and Equipment [Line Items]    
Total cost 4,994 3,901
Internal-use software development    
Property, Plant and Equipment [Line Items]    
Total cost 22,930 19,968
Automobile    
Property, Plant and Equipment [Line Items]    
Total cost 605 502
Land    
Property, Plant and Equipment [Line Items]    
Total cost $ 16,394 $ 0