Summary of Property, Plant and Equipment by Geographic Location (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Property, plant, and equipment, net	$ 889	$ 782
United States
Segment Reporting Information [Line Items]
Property, plant, and equipment, net	618	486
International
Segment Reporting Information [Line Items]
Property, plant, and equipment, net	$ 271	$ 296

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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