Revenue - Summary of Revenue Disaggregated by Types and Geography (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 87,782	$ 80,962	$ 34,042
Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	79,504	76,626	30,458
Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	7,803	3,861	3,109
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	46,236	34,231	11,506
U.S. | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	41,985	32,265	9,529
U.S. | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	4,251	1,966	1,977
Outside of U.S. ("OUS")
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	41,546	46,731	22,536
Outside of U.S. ("OUS") | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	37,519	44,361	20,929
Outside of U.S. ("OUS") | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	3,552	1,895	1,132
Outside of U.S. ("OUS") | Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 475	$ 475	$ 475