Long-Lived Assets by Geographic Location (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,392	$ 2,042
Operating lease ROU assets	3,463	4,629
Americas
Segment Reporting Information [Line Items]
Property and equipment, net	677	839
Operating lease ROU assets	2,356	4,265
Europe and the Middle East
Segment Reporting Information [Line Items]
Property and equipment, net	75	55
Operating lease ROU assets	129	105
Asia-Pacific
Segment Reporting Information [Line Items]
Property and equipment, net	1,640	1,148
Operating lease ROU assets	$ 978	$ 259