Long-Lived Assets by Geographic Location (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Segment Reporting Information [Line Items]
Property and equipment, net	$ 3,768	$ 2,827	$ 2,827
Operating lease ROU assets	2,974	$ 3,405	3,405
Americas
Segment Reporting Information [Line Items]
Property and equipment, net	646		606
Operating lease ROU assets	1,818		2,100
Europe and the Middle East
Segment Reporting Information [Line Items]
Property and equipment, net	83		73
Operating lease ROU assets	190		224
Asia-Pacific
Segment Reporting Information [Line Items]
Property and equipment, net	3,039		2,148
Operating lease ROU assets	$ 966		$ 1,081