Equipment, Software and Leasehold Improvements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Equipment, Software and Leasehold Improvements, Net [Abstract]
Equipment, software and leasehold improvements	$ 5,585		$ 5,432
Accumulated depreciation	(4,891)		(4,816)
Equipment, software and leasehold improvements, net of accumulated depreciation of $4,737 and $4,584	694		616
Depreciation expense	76	$ 108	108
Computer and Equipment [Member]
Equipment, Software and Leasehold Improvements, Net [Abstract]
Equipment, software and leasehold improvements	2,233		2,229
Software [Member]
Equipment, Software and Leasehold Improvements, Net [Abstract]
Equipment, software and leasehold improvements	1,845		1,695
Capitalization of internal-use software cost	150
Leasehold Improvements [Member]
Equipment, Software and Leasehold Improvements, Net [Abstract]
Equipment, software and leasehold improvements	659		660
Furniture and Fixtures [Member]
Equipment, Software and Leasehold Improvements, Net [Abstract]
Equipment, software and leasehold improvements	$ 848		$ 848

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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- Definition

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

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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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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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