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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,380	$ 5,244
Less accumulated depreciation	(3,240)	(3,118)
Property and equipment, net	2,140	2,126
Computers, Software, and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	572	572
Furniture, Fixtures, and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	299	299
Manufacturing and Testing Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,462	3,444
Equipment Construction in Process
Property Plant And Equipment [Line Items]
Property and equipment, gross	136	18
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 911	$ 911

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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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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