Revenue - Schedule of Net Revenue by OCS Product and Country (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Net revenue	[1]	$ 15,880	$ 7,053
United States [Member]
Disaggregation Of Revenue [Line Items]
Net revenue	[1]	13,561	5,757
All Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Net revenue	[1]	2,319	1,296
OCS Lung net revenue [Member]
Disaggregation Of Revenue [Line Items]
Net revenue		2,298	2,430
OCS Heart net revenue [Member]
Disaggregation Of Revenue [Line Items]
Net revenue		5,713	4,181
OCS Liver net revenue [Member]
Disaggregation Of Revenue [Line Items]
Net revenue		$ 7,869	$ 442

[1] Net revenue by country is categorized based on the location of the end customer.