Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 11,001	$ 11,699	$ 32,269	$ 37,108
Wireless
Disaggregation Of Revenue [Line Items]
Revenues	11,001	11,699	32,269	37,108
Wireless | License and service fees
Disaggregation Of Revenue [Line Items]
Revenues	741	957	2,619	2,818
Wireless | Hosted environment usage fees
Disaggregation Of Revenue [Line Items]
Revenues	749	1,074	2,309	3,937
Wireless | Cloud based usage fees
Disaggregation Of Revenue [Line Items]
Revenues	9,254	9,388	26,438	28,936
Wireless | Consulting services and other
Disaggregation Of Revenue [Line Items]
Revenues	$ 257	$ 280	$ 903	$ 1,417