Long-Lived Assets by Geographic Location (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Property and equipment, net	$ 4,131	$ 2,827
Operating lease ROU assets	2,370	3,405
Americas
Segment Reporting Information [Line Items]
Property and equipment, net	587	606
Operating lease ROU assets	1,504	2,100
Europe and the Middle East
Segment Reporting Information [Line Items]
Property and equipment, net	330	73
Operating lease ROU assets	138	224
Asia-Pacific
Segment Reporting Information [Line Items]
Property and equipment, net	3,214	2,148
Operating lease ROU assets	$ 728	$ 1,081