Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2001
Carrier Data Providers [Member]
Long Term Purchase Commitment [Line Items]
Future minimum payments for the year, 2020	$ 8,091
Future minimum payments for the year, 2021	5,944
Future minimum payments for the year, 2022	6,093
Future minimum payments for the year, 2023	6,245
Procurement Agreement [Member] | Europe [Member] | Airtime [Member]
Long Term Purchase Commitment [Line Items]
Credits provided				$ 3,736
Credits used	30	$ 30	$ 31
Unused credits granted	$ 1,918	$ 1,948