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Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2013
Property and Equipment [Abstract]  
Schedule property and equipment
Property and Equipment:
 
   
March 31, 2013
  
December 31, 2012
 
   
(unaudited)
    
Lasers-in-service
 $8,594  $7,301 
Equipment, computer hardware and software
  4,220   4,015 
Furniture and fixtures
  619   617 
Leasehold improvements
  399   396 
    13,832   12,329 
Accumulated depreciation and amortization
  (6,088)  (5,570)
Property and equipment, net
 $7,744  $6,759