Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 11,699	$ 16,443	$ 37,108	$ 43,743
Wireless
Disaggregation Of Revenue [Line Items]
Revenues	11,699	16,443	37,108	43,743
Wireless | License and service fees
Disaggregation Of Revenue [Line Items]
Revenues	957	818	2,818	3,199
Wireless | Hosted environment usage fees
Disaggregation Of Revenue [Line Items]
Revenues	1,074	3,475	3,937	11,573
Wireless | Cloud based usage fees
Disaggregation Of Revenue [Line Items]
Revenues	9,388	11,446	28,936	27,047
Wireless | Consulting services and other
Disaggregation Of Revenue [Line Items]
Revenues	$ 280	$ 704	$ 1,417	$ 1,924