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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value $ 500  
Fair Value, Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 1,181 $ 18,529
Contingent consideration (18,960) (28,560)
Deferred compensation plan, Liabilities (1,254) (1,275)
Liabilities fair value, Total (20,214) (29,835)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 471  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 219  
Deferred compensation plan, Liabilities (1,254)  
Liabilities fair value, Total (1,254)  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 491  
Contingent consideration (18,960)  
Liabilities fair value, Total (18,960)  
Fair Value, Measurements, Recurring [Member] | Treasury Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 471 490
Fair Value, Measurements, Recurring [Member] | Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 471  
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Bone Biologics Inc [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 219 219
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Bone Biologics Inc [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 219  
Fair Value, Measurements, Recurring [Member] | Debt Security [Member] | eNeura Inc [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value   $ 17,820
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | eNeura Inc [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 491  
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member] | eNeura Inc [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value $ 491