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Composition of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 161,711 $ 161,265
Accumulated depreciation (97,404) (92,082)
Total property and equipment, net 64,307 69,183
Office Equipment, Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,650 10,526
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 12,012 12,012
Network Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 139,049 $ 138,727