REVENUE - Summary of Revenue Disaggregated by Types and Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 15,525	$ 14,250
Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	11,379	11,470
Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	4,027	2,661
Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	119	119
U.S.
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	7,434	3,084
U.S. | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	5,067	1,618
U.S. | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	2,367	1,466
Outside of U.S. ("OUS")
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	8,091	11,166
Outside of U.S. ("OUS") | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	6,312	9,852
Outside of U.S. ("OUS") | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	1,660	1,195
Outside of U.S. ("OUS") | Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 119	$ 119