Information about Geographic Areas and Operating Segments - Total Revenue and Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Total revenue:
Total revenue	$ 16,729	$ 15,096
Long-lived assets:
Total long-lived assets	1,963		$ 2,533
North America [Member]
Total revenue:
Total revenue	13,776	14,528
Long-lived assets:
Total long-lived assets	1,688		2,016
Asia [Member]
Total revenue:
Total revenue	2,314	107
Long-lived assets:
Total long-lived assets			177
Europe [Member]
Total revenue:
Total revenue	639	$ 461
Long-lived assets:
Total long-lived assets	$ 275		$ 340