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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross $ 19,945   $ 19,945   $ 18,833
Accumulated depreciation and amortization (15,377)   (15,377)   (13,532)
Property and equipment, net 4,568   4,568   5,301
Depreciation and related amortization expense 637 $ 850 2,079 $ 2,762  
Lasers Placed-In-Service [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 19,647   19,647   18,515
Equipment, Computer Hardware and Software [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 147   147   168
Furniture and Fixtures [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 125   125   124
Leasehold Improvements [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross $ 26   $ 26   $ 26