Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment
Property and Equipment, Total	$ 4,359	$ 4,198
Less accumulated depreciation and amortization	(3,733)	(3,521)
Property and equipment, net	626	677
Depreciation expense	221	278	$ 463
Umbrella Agreement with Aroa
Property and Equipment
Property and Equipment, Total	200	200
Lab equipment
Property and Equipment
Property and Equipment, Total	$ 2,304	2,250
Estimated useful lives	5 years
Furniture and fixtures
Property and Equipment
Property and Equipment, Total	$ 118	112
Estimated useful lives	5 years
Computer equipment and software
Property and Equipment
Property and Equipment, Total	$ 577	508
Estimated useful lives	3 years
Leasehold improvements
Property and Equipment
Property and Equipment, Total	$ 1,360	$ 1,328

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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