Revenue Recognition - Schedule of Disaggregated Revenue By Major Product Line in Single Reporting Segment (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]
Total	$ 7,747	$ 6,278	$ 15,158	$ 12,978
Service [Member]
Disaggregation Of Revenue [Line Items]
Total	4,503	3,791	8,123	7,575
Subscription [Member]
Disaggregation Of Revenue [Line Items]
Total	3,244	2,487	7,035	5,403
Government [Member]
Disaggregation Of Revenue [Line Items]
Total	3,877	3,822	7,449	7,707
Government [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total	3,389	3,522	6,661	7,107
Government [Member] | Subscription [Member]
Disaggregation Of Revenue [Line Items]
Total	488	300	788	600
Commercial [Member]
Disaggregation Of Revenue [Line Items]
Total	3,870	2,456	7,709	5,271
Commercial [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total	1,114	269	1,462	468
Commercial [Member] | Subscription [Member]
Disaggregation Of Revenue [Line Items]
Total	$ 2,756	$ 2,187	$ 6,247	$ 4,803