Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,933	$ 10,854	$ 26,255	$ 19,286
Wireless [Member]
Disaggregation Of Revenue [Line Items]
Revenues	12,701	10,637	25,916	18,809
Wireless [Member] | License and Service Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,008		1,563
Wireless [Member] | Hosted Environment Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,341	5,293	8,890	9,947
Wireless [Member] | Cloud Based Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6,705	4,510	14,352	7,429
Wireless [Member] | Consulting Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	647	834	1,111	1,433
Graphics [Member] | Software [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 232	$ 217	$ 339	$ 477