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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (21,847)	$ (20,632)
Net property, plant and equipment	5,325	4,960
Depreciable Property, Plant And Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	26,778	24,074
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	173	173
Office and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	7,082	5,638
Software
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	16,487	15,227
Test equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	347	347
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	2,689	2,689
Add: Assets under development
Property, Plant and Equipment [Line Items]
Total property, plant and equipment gross	$ 394	$ 1,518

X

- 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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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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