Significant Accounting Policies - Schedule of Revenues, Based on Shipment Destination or Research Services Location (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 30,380	$ 24,195	$ 90,147	$ 77,255
U.S. [Member]
Segment Reporting Information [Line Items]
Revenue	16,734	9,736	45,033	31,501
International [Member]
Segment Reporting Information [Line Items]
Revenue	$ 13,646	$ 14,459	$ 45,114	$ 45,754