Segment Information (Revenue by Geographic Region) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 58,183	$ 68,062
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	36,494	43,704
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	9,133	9,375
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 12,556	$ 14,983