Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 10,930	$ 12,735
Wireless
Disaggregation Of Revenue [Line Items]
Revenues	10,930	12,735
Wireless | License and service fees
Disaggregation Of Revenue [Line Items]
Revenues	1,000	828
Wireless | Hosted environment usage fees
Disaggregation Of Revenue [Line Items]
Revenues	819	1,429
Wireless | Cloud based usage fees
Disaggregation Of Revenue [Line Items]
Revenues	8,677	9,878
Wireless | Consulting services and other
Disaggregation Of Revenue [Line Items]
Revenues	$ 434	$ 600