Fair Value Measurements and Investments- Schedule of Financial Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	$ 12,160	$ 219
Deferred compensation plan, Liabilities	(1,441)	(1,255)
Liabilities fair value, Total	(37,216)	(43,955)
Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	(35,400)	(42,700)
Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	(375)
Convertible Loan Agreement [Member] | Neo Medical SA [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	7,160
Preferred Equity Securities [Member] | Neo Medical SA [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	5,000
Equity Securities [Member] | Bone Biologics Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value		219
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	5,000	219
Deferred compensation plan, Liabilities	(1,441)	(1,255)
Liabilities fair value, Total	(1,441)	(1,255)
Fair Value, Inputs, Level 2 [Member] | Preferred Equity Securities [Member] | Neo Medical SA [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	5,000
Fair Value, Inputs, Level 2 [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
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	7,160
Liabilities fair value, Total	(35,775)	(42,700)
Fair Value, Inputs, Level 3 [Member] | Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	(35,400)	$ (42,700)
Fair Value, Inputs, Level 3 [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	(375)
Fair Value, Inputs, Level 3 [Member] | Convertible Loan Agreement [Member] | Neo Medical SA [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets fair value	$ 7,160