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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

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