REVENUE - Summary of Revenue Disaggregated by Types and Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 15,030	$ 14,224	$ 30,555	$ 28,474
Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	10,917	10,615	22,296	22,085
Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	3,994	3,490	8,021	6,151
Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	119	119	238	238
U.S.
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	12,475	7,714	19,909	10,798
U.S. | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	10,140	5,685	15,207	7,303
U.S. | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	2,335	2,029	4,702	3,495
Outside of U.S. ("OUS")
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	2,555	6,510	10,646	17,676
Outside of U.S. ("OUS") | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	777	4,930	7,089	14,782
Outside of U.S. ("OUS") | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	1,659	1,461	3,319	2,656
Outside of U.S. ("OUS") | Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 119	$ 119	$ 238	$ 238