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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

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