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Summary of Significant Accounting Policies - Summary of Product Revenue by Geographical Locations of Customers (Detail) - Product - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total product revenue	$ 23,607	$ 18,019	$ 63,721	$ 53,732
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Total product revenue	14,527	12,806	41,210	38,207
North America
Disaggregation Of Revenue [Line Items]
Total product revenue	8,465	4,792	20,942	14,501
Other
Disaggregation Of Revenue [Line Items]
Total product revenue	$ 615	$ 421	$ 1,569	$ 1,024

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