Property and Equipment - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 55,503	$ 43,869
Less: Accumulated depreciation and amortization	(28,460)	(23,041)
Total property and equipment, net	$ 27,043	20,828
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Useful Life (Years)	5 years
Property and equipment, gross	$ 19,067	15,311
Prototype instruments
Property, Plant and Equipment [Line Items]
Useful Life (Years)	2 years
Property and equipment, gross	$ 2,128	2,128
Computer equipment
Property, Plant and Equipment [Line Items]
Useful Life (Years)	3 years
Property and equipment, gross	$ 5,597	3,860
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful Life (Years)	5 years
Property and equipment, gross	$ 1,927	1,990
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,641	19,347
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,143	$ 1,233