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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross $ 25,693   $ 25,693   $ 23,374
Accumulated depreciation and amortization (19,290)   (19,290)   (17,845)
Property and equipment, net 6,403   6,403   5,529
Depreciation and related amortization expense 575 $ 454 1,576 $ 1,535  
Gain on disposal of property and equipment     (73) $ (23)  
Property plant and equipment disposal, original cost 204   204    
Property plant and equipment disposal, accumulated depreciation 131   131    
Lasers Placed-In-Service [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 25,190   25,190   22,942
Equipment, Computer Hardware and Software [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 224   224   146
Furniture and Fixtures [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross 236   236   243
Leasehold Improvements [Member]          
Property, Plant and Equipment, Net [Abstract]          
Property and equipment, gross $ 43   $ 43   $ 43