Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Property and Equipment
Property and equipment, gross	$ 5,061	$ 5,025
Less: Accumulated depreciation and amortization	(3,458)	(4,175)
Total Property, Plant and Equipment, Net	1,603	850
Depreciation expense	925	831
Laboratory and demonstration equipment
Property and Equipment
Property and equipment, gross	4,789	4,394
Computer equipment and software
Property and Equipment
Property and equipment, gross	139	417
Furniture and fixtures
Property and Equipment
Property and equipment, gross	112	193
Leasehold improvements
Property and Equipment
Property and equipment, gross	$ 21	$ 21

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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