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Property and Equipment - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total cost $ 100,844 $ 97,725
Less—accumulated depreciation (50,184) (46,080)
Property and equipment, net 50,660 51,645
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total cost 2,348 2,341
Computer and office equipment    
Property, Plant and Equipment [Line Items]    
Total cost 4,190 4,077
Telecommunications equipment    
Property, Plant and Equipment [Line Items]    
Total cost 61,753 60,651
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total cost 6,280 6,285
Software    
Property, Plant and Equipment [Line Items]    
Total cost 4,877 3,901
Internal-use software development    
Property, Plant and Equipment [Line Items]    
Total cost 20,884 19,968
Automobile    
Property, Plant and Equipment [Line Items]    
Total cost $ 512 $ 502