Property and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 19,113		$ 18,833
Accumulated depreciation and amortization	(14,151)		(13,532)
Property and equipment, net	4,962		5,301
Depreciation and related amortization expense	751	$ 986
Lasers Placed-In-Service [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	18,822		18,515
Equipment, Computer Hardware and Software [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	141		168
Furniture and Fixtures [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	124		124
Leasehold Improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 26		$ 26

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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-Publisher FASB
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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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- Definition

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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