Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 10,338	$ 12,674	$ 21,268	$ 25,409
Wireless
Disaggregation Of Revenue [Line Items]
Revenues	10,338	12,674	21,268	25,409
Wireless | License and service fees
Disaggregation Of Revenue [Line Items]
Revenues	878	1,033	1,878	1,861
Wireless | Hosted environment usage fees
Disaggregation Of Revenue [Line Items]
Revenues	735	1,434	1,560	2,863
Wireless | Cloud based usage fees
Disaggregation Of Revenue [Line Items]
Revenues	8,506	9,670	17,178	19,548
Wireless | Consulting services and other
Disaggregation Of Revenue [Line Items]
Revenues	$ 219	$ 537	$ 652	$ 1,137