Adjusted carrying value of restructured debt.

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Class Of Warrant Or Right Weighted Average Exercise Price Of Warrants Or Rights

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Debt instrument convertible conversion subject to certain anti-dilution price per share.

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Future contingent milestone payments.

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Impairment charges on Investments.

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Milestone achievement period.

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Payments obligation for contingent consideration.

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Percentage of number of warrant issued equal to outstanding principal and accrued interest on debt security.

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Warrant contractual term.

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Warrants exercisable period.

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Warrants expiration year.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of liability recognized arising from contingent consideration in a business combination.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($)				3 Months Ended	12 Months Ended
	Mar. 01, 2019	Feb. 14, 2019	Apr. 30, 2018	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Feb. 06, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Increase in fair value primarily attributable to change in forecast of future net sales					$ 29,100,000
Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Milestone achievement period			5 years		12 months
Contingent consideration					$ 42,700,000
Spinal Kinetics [Member] \| Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration					14,700,000
Spinal Kinetics [Member] \| Other Long-term Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration					$ 28,000,000.0
Maximum [Member] \| Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Future milestone payments			$ 60,000,000.0
US Food And Drug Administration [Member] \| Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Future milestone payments			15,000,000.0				$ 15,000,000.0
Payments obligation for contingent consideration		$ 15,000,000.0
Revenue Milestone [Member] \| Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Future milestone payments			$ 45,000,000.0
Bone Biologics Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants held for share purchases					13
Weighted average exercise price of warrant					$ 10.00
Warrants exercisable period					7 years
Warrant expiration year					2020
eNeura Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payments of restructured debt security				$ 4,000,000.0
Adjusted carrying value of restructured debt				4,000,000.0
Other-than-temporary impairment on restructured debt securities				6,500,000
eNeura Inc [Member] \| Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized gains on restructured debt securities				$ 5,200,000
eNeura Inc [Member] \| Amended and Restated Senior Secured Promissory Note [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt maturity date					Mar. 04, 2019
Principal amount of the debt security					$ 15,000.0
Accrued interest rate					8.00%
Debt securities, maturity date description					Amended and Restated Senior Secured Promissory Note with eNeura (the “Restructured Debt Security”) to restructure the debt security, which extended the maturity date to the earlier of (i) March 4, 2022, (ii) the effective date of a change in control, or (iii) the effective date of an initial public offering by eNeura, and which also eliminated the conversion feature included within the original note.
Warrant exercisable price per share	$ 0.01
Warrant contractual term	10 years
Percentage of number of warrant issued equal to outstanding principal and accrued interest on debt security	10.00%
Debt security subject to certain anti-dilution provision price per share	$ 1.00
Debt securities amortized cost basis						$ 9,000,000.0
Equity Warrants [Member] \| Bone Biologics Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants fair value Reduced						0
Impairment charges on investment						$ 4,400,000