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Composition of Certain Consolidated Financial Statement Items - Property and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 11,739	$ 13,062
Less: accumulated depreciation and amortization	(6,694)	(4,788)
Total property and equipment, net	5,045	8,274
Laboratory, manufacturing and computer equipment, and furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	2,874	2,645
Rental equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	1,082	1,247
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	4,941	4,941
Evaluation units
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,842	$ 4,229

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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