Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net - Schedule of property and equipment, net (Details)

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Property and Equipment, Net - Schedule of property and equipment, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 3,917 $ 1,934
Accumulated depreciation (1,108) (775)
Property and equipment, net 2,809 1,159
Computer Hardware And Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 366 301
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 71 60
Machinery And Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,040 745
Demonstration Lasers And Lasers Placed With Customers [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,097 483
Automobiles [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 200 154
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 93 13
Construction In Progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 50 $ 178