Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,674	$ 15,919	$ 25,409	$ 27,300
License and service fees
Disaggregation Of Revenue [Line Items]
Revenues	1,033
Wireless
Disaggregation Of Revenue [Line Items]
Revenues	12,674	15,919	25,409	27,300
Wireless | License and service fees
Disaggregation Of Revenue [Line Items]
Revenues		795	1,861	2,382
Wireless | Hosted environment usage fees
Disaggregation Of Revenue [Line Items]
Revenues	1,434	3,956	2,863	8,097
Wireless | Cloud based usage fees
Disaggregation Of Revenue [Line Items]
Revenues	9,670	10,555	19,548	15,602
Wireless | Consulting services and other
Disaggregation Of Revenue [Line Items]
Revenues	$ 537	$ 613	$ 1,137	$ 1,219