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

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- Definition

Future contingent milestone payments.

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Milestone achievement period.

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Payments obligation for contigent consideration.

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- Definition

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

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No definition available.

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Warrant contractual term.

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No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

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

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- Definition

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

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- Definition

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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No definition available.

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Fair Value Measurements - Additional Information (Detail) - USD ($)				6 Months Ended
	Mar. 01, 2019	Feb. 14, 2019	Apr. 30, 2018	Jun. 30, 2019	Feb. 06, 2019
Spinal Kinetics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Milestone achievement period			5 years
Spinal Kinetics [Member] \| Other Long-term Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration				$ 19,400,000
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 contigent 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
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
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
Equity Warrants [Member] \| Bone Biologics Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of warrants				$ 0
Warrant [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of warrant				$ 500,000