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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Schedule property and equipment [Abstract]      
Property and equipment, gross $ 13,832   $ 12,329
Accumulated depreciation and amortization (6,088)   (5,570)
Total property and equipment, net 7,744 [1]   6,759
Depreciation and related amortization expense 634 638  
Lasers-in-service [Member]
     
Schedule property and equipment [Abstract]      
Property and equipment, gross 8,594   7,301
Equipment, Computer Hardware and Software [Member]
     
Schedule property and equipment [Abstract]      
Property and equipment, gross 4,220   4,015
Furniture and Fixtures [Member]
     
Schedule property and equipment [Abstract]      
Property and equipment, gross 619   617
Leasehold Improvements [Member]
     
Schedule property and equipment [Abstract]      
Property and equipment, gross $ 399   $ 396
[1] (unaudited)