Revenues - Schedule of Revenues on Disaggregated Basis (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,278	$ 11,782	$ 10,854	$ 8,432	$ 7,352	$ 6,525	$ 6,945	$ 5,463	$ 43,346	$ 26,285
Wireless [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,181	$ 11,614	$ 10,637	$ 8,172	$ 6,869	$ 6,283	$ 6,506	$ 4,816	42,604	24,474
Wireless [Member] | Hosted Environment Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues									19,517	18,889
Wireless [Member] | Cloud Based Usage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenues									20,011	3,327
Wireless [Member] | Consulting Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues									3,076	2,258
Graphics [Member] | Software [Member]
Disaggregation Of Revenue [Line Items]
Revenues									$ 742	$ 1,811