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Fair Value Measurements - Additional Information (Detail) - USD ($) |  |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 14, 2019 | Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 06, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Amortized cost basis |  |  | $ 9,000,000.0 | $ 9,000,000.0 |  |  |
Other-than-temporary impairment on debt securities |  |  |  |  | $ 5,585,000 | $ 2,727,000 |
Changes in fair value of contingent consideration |  |  |  | 3,069,000 |  |  |
Spinal Kinetics [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Milestone achievement period |  | 5 years |  |  |  |  |
Contingent consideration |  | $ 25,500,000 | 28,600,000 | 28,600,000 |  |  |
Spinal Kinetics [Member] | Operating Expense [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Changes in fair value of contingent consideration |  |  | 3,100,000 | 1,400,000 |  |  |
Other Current Liabilities [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  | 13,600,000 | 13,600,000 |  |  |
Other Long-term Liabilities [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  | 15,000,000.0 | 15,000,000.0 |  |  |
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 |  |  |  |  |
US Food And Drug Administration [Member] | Spinal Kinetics [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Future milestone payments |  |  |  |  |  |  | $ 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 |  |  |  |  |
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of debt securities |  |  | $ 17,820,000 | 17,820,000 | $ 16,050,000 | $ 12,220,000 |
Net increase in estimated fair value of the debt securities |  |  |  | 1,800,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants’ value Reduced |  |  |  | $ 0 |  |  |

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