Information about Geographic Areas - Additional Information (Detail) - Foreign Countries - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net carrying value of long lived assets	$ 9,957		$ 8,727
External Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 17,568	$ 16,295