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Subsequent Events - Additional Information (Detail) - USD ($)
shares in Millions
8 Months Ended 12 Months Ended
Feb. 25, 2019
Feb. 14, 2019
Jan. 31, 2019
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2018
Feb. 06, 2019
Subsequent Event [Line Items]              
Changes in fair value of contingent consideration           $ 3,069,000  
Spinal Kinetics [Member]              
Subsequent Event [Line Items]              
Consideration for the asssets acquired       $ 76,055,000   76,600,000  
Contingent consideration       25,500,000 $ 28,600,000 28,600,000  
Spinal Kinetics [Member] | US Food And Drug Administration [Member]              
Subsequent Event [Line Items]              
Future milestone payments       $ 15,000,000.0      
Spinal Kinetics [Member] | Operating Expense [Member]              
Subsequent Event [Line Items]              
Changes in fair value of contingent consideration         3,100,000 1,400,000  
Other Current Liabilities [Member] | Spinal Kinetics [Member]              
Subsequent Event [Line Items]              
Contingent consideration         $ 13,600,000 $ 13,600,000  
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Consideration for the asssets acquired     $ 6,400,000        
Subsequent Event [Member] | Spinal Kinetics [Member] | US Food And Drug Administration [Member]              
Subsequent Event [Line Items]              
Future milestone payments             $ 15,000,000.0
Payments obligation for contigent consideration   $ 15,000,000.0          
Subsequent Event [Member] | Options Medical Founder              
Subsequent Event [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 period of restricted stock units     4 months        
Subsequent Event [Member] | President and Chief Executive Officer [Member] | Transition and Retirement Agreement [Member]              
Subsequent Event [Line Items]              
Share based compensation, vesting period of restricted stock units 1 year            
Transition consulting services payable per month $ 40,000            
Share based compensation, grant date fair market value of restricted stock units $ 2,000,000