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Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2018
Apr. 30, 2018
Summary Of Significant Accounting Policies [Line Items]                          
Net sales $ 121,494,000 $ 113,499,000 $ 115,850,000 $ 109,112,000 $ 121,078,000 $ 111,708,000 $ 111,547,000 $ 108,709,000 $ 459,955,000 $ 453,042,000 $ 433,823,000    
Freezing amount in cash resulted from court pending legal action issued   $ 700,000     $ 2,600,000         2,600,000   $ 2,500,000  
Advertising costs                 800,000 600,000 700,000    
Spinal Kinetics [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
In-process research and development costs                         $ 26,800,000
Musculoskeletal Transplant Foundation ("MTF") [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Expenditures for other research and development                 0 0 900,000    
Customers and Distributors Based in Europe [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Net sales                 69,000,000        
Maximum [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Transactional foreign currency gains and (losses), including those generated from intercompany operations                 $ (1,400,000) (3,300,000) $ 1,900,000    
General and administrative [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Decreases to general and administrative expenses                   $ (1,300,000)