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Acquisitions - Additional Information (Detail) - USD ($)
shares in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2019
Apr. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Feb. 06, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                
Goodwill     $ 71,177,000   $ 71,177,000     $ 72,401,000
Consideration for the assets acquired $ 6,400,000              
Options Medical Founder [Member]                
Business Acquisition [Line Items]                
Share based compensation, grant of restricted stock units 25,478              
Share based compensation, grant fair value of restricted stock units $ 1,400,000              
Share based compensation, vesting rights of RSUs 33.33%              
Spinal Kinetics [Member]                
Business Acquisition [Line Items]                
Business acquisition date   Apr. 30, 2018            
Business acquisition conversion of shares into net cash subject to adjustments   $ 45,000,000.0            
Fair value of the consideration transferred   76,600,000            
Goodwill   17,612,000            
Acquisition related costs     0 $ 1,500,000 0 $ 3,000,000.0    
Net sales from acquisition     3,200,000 2,300,000 6,400,000 2,300,000    
Net loss from Acquisition     $ 3,400,000 $ 1,800,000 $ 7,400,000 $ 1,800,000    
Spinal Kinetics [Member] | Global Spine [Member]                
Business Acquisition [Line Items]                
Goodwill             $ 17,600,000  
Spinal Kinetics [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Future milestone payments   $ 60,000,000.0