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Revenue recognition
 6 Months Ended
Jul. 03, 2021
Revenue from Contract with Customer [Abstract]  
Revenue recognition
10. Revenue recognition
Our policies for recognizing sales have not changed from those described in the Company’s 2020 Annual Report on Form
10-K.
The Company attributes net sales to external customers to the U.S. and to all foreign countries based on the legal entity from which the sale originated. The following table presents our net sales by segment disaggregated by geographic markets and major products (Vertical) as follows:​​​​​​​
 
    
Three Months Ended
     
Six Months Ended
  
    
July 3, 2021
     
June 27, 2020
     
July 3, 2021
     
June 27, 2020
  
Primary geographic markets:
            
U.S.
    $ 98,682    $ 53,166    $ 173,220    $ 125,136
International
      11,134      4,851      18,374      11,526
  
 
 
     
 
 
     
 
 
     
 
 
  
Total net sales
    $ 109,816    $ 58,017    $ 191,594    $ 136,662
  
 
 
     
 
 
     
 
 
     
 
 
  
Vertical:
            
Pain Treatments and Joint Preservation
    $ 56,704    $ 28,868    $ 98,234    $ 70,151
Restorative Therapies
      32,511      17,968      54,332      41,433
Bone Graft Substitutes
      20,601      11,181      39,028      25,078
  
 
 
     
 
 
     
 
 
     
 
 
  
Total net sales
    $ 109,816    $ 58,017    $ 191,594    $ 136,662