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BUSINESS COMBINATION - Estimated fair value and useful life of identifiable intangible assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2020
Mar. 09, 2020
Mar. 31, 2021
Dec. 31, 2020
Patents        
Business Acquisition        
Remaining Economic Useful Life (in years)     14 years 6 months 14 years 8 months 12 days
ApiFix Ltd        
Business Acquisition        
Fair value of identifiable intangible assets $ 40,790      
ApiFix Ltd | Patents        
Business Acquisition        
Finite-lived intangible assets acquired $ 31,720      
Remaining Economic Useful Life (in years) 15 years      
ApiFix Ltd | Customer Relationships        
Business Acquisition        
Finite-lived intangible assets acquired $ 230      
Remaining Economic Useful Life (in years) 10 years      
ApiFix Ltd | Non-competition Agreements        
Business Acquisition        
Finite-lived intangible assets acquired $ 200      
Remaining Economic Useful Life (in years) 4 years      
ApiFix Ltd | Trademarks / Names        
Business Acquisition        
Indefinite-lived intangible assets acquired $ 8,640      
Telos        
Business Acquisition        
Fair value of identifiable intangible assets   $ 1,160    
Telos | Customer Relationships        
Business Acquisition        
Finite-lived intangible assets acquired   $ 910    
Remaining Economic Useful Life (in years)   10 years    
Telos | Non-competition Agreements        
Business Acquisition        
Finite-lived intangible assets acquired   $ 40    
Remaining Economic Useful Life (in years)   5 years    
Telos | Trademarks / Names        
Business Acquisition        
Indefinite-lived intangible assets acquired   $ 210