Revenue - Summary of Revenue Disaggregated by Types and Geography (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 57,017	$ 87,782	$ 80,962
Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	42,742	79,504	76,626
Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	13,800	7,803	3,861
Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	475	475	475
U.S.
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	16,167	46,236	34,231
U.S. | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	8,428	41,985	32,265
U.S. | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	7,739	4,251	1,966
Outside of U.S. ("OUS")
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	40,850	41,546	46,731
Outside of U.S. ("OUS") | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	34,314	37,519	44,361
Outside of U.S. ("OUS") | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	6,061	3,552	1,895
Outside of U.S. ("OUS") | Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 475	$ 475	$ 475