Property and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 24,114		$ 23,374
Accumulated depreciation and amortization	(18,326)		(17,845)
Property and equipment, net	5,788		5,529
Depreciation and related amortization expense	481	$ 586
Lasers Placed-In-Service [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	23,596		22,942
Equipment, Computer Hardware and Software [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	223		146
Furniture and Fixtures [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	252		243
Leasehold Improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 43		$ 43

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 aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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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.

+ References

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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.

+ References

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