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Fair Value Measurements - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2019 | Feb. 14, 2019 | Apr. 30, 2018 | Mar. 31, 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 |  |  |  | $ 19,000,000.0 |
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 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 |  |
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of warrant |  |  |  | $ 500,000 |
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 |  |  |  |
Common Stock [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of warrants |  |  |  | $ 0 |

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