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v3.19.3

Fair Value Measurements and Investments - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2019 | Feb. 14, 2019 | Apr. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Feb. 06, 2019
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 |  |  |  | $ 41,700,000 |  | $ 41,700,000 |  |
Recognition of expense for contingent consideration |  |  |  | 22,300,000 |  | 28,100,000 |  |
Spinal Kinetics [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 14,500,000 |  | 14,500,000 |  |
Spinal Kinetics [Member] | Other Long-term Liabilities [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 27,200,000 |  | 27,200,000 |  |
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 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 |  |  |  |  |
ENeura Restructured Debt Security [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Interest income |  |  |  | 500,000 | $ 0 | 1,500,000 | $ 0 |
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 |  | 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 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Unrealized gains on restructured debt securities |  |  |  | $ 5,200,000 |  | $ 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 |  |
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 |  |

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