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 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.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 18,833	$ 18,437
Accumulated depreciation and amortization	(13,532)	(10,734)
Property and equipment, net	5,301	7,703	$ 5,698	$ 6,271	$ 6,916	$ 8,658	$ 9,396	$ 9,975
Depreciation and related amortization expense	3,563	4,341
Impairment of long-lived assets	(194)	(196)
Loss on disposal of property and equipment	(407)	0
Lasers Placed-In-Service [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	18,515	17,820
Equipment, Computer Hardware and Software [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	168	462
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	$ 31