Total Net Revenue Based on Disaggregation Criteria (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 22,162	$ 18,120
Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net revenue	21,314	16,860
Over Time
Disaggregation Of Revenue [Line Items]
Total net revenue	848	1,260
Americas
Disaggregation Of Revenue [Line Items]
Total net revenue	15,148	13,868
Americas | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net revenue	14,396	12,705
Americas | Over Time
Disaggregation Of Revenue [Line Items]
Total net revenue	752	1,163
Europe and the Middle East
Disaggregation Of Revenue [Line Items]
Total net revenue	2,460	2,601
Europe and the Middle East | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net revenue	2,364	2,504
Europe and the Middle East | Over Time
Disaggregation Of Revenue [Line Items]
Total net revenue	96	97
Asia-Pacific
Disaggregation Of Revenue [Line Items]
Total net revenue	4,554	1,651
Asia-Pacific | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 4,554	$ 1,651