Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,629	$ 11,782	$ 38,883	$ 31,068
Wireless [Member]
Disaggregation Of Revenue [Line Items]
Revenues	12,509	11,614	38,424	30,422
Wireless [Member] | License and Service Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,006		2,569
Wireless [Member] | Hosted Environment Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,555	4,916	13,444	14,863
Wireless [Member] | Cloud Based Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6,068	5,650	20,420	13,079
Wireless [Member] | Consulting Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	880	1,048	1,991	2,480
Graphics [Member] | Software [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 120	$ 168	$ 459	$ 646