Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 7,641	$ 6,070
Accumulated depreciation	(2,223)	(1,313)
Property and equipment, net	5,418	4,757
Demonstration Lasers And Lasers Placed With Customers [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,521	3,254
Machinery And Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,236	1,135
Automobiles [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,358	1,115
Computer Hardware And Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	359	366
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	119	104
Furniture And Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 48	82
Construction In Progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 14

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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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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