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Fair Value Measurements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 5 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock, value |  |  |  | $ 0 |  | $ 500 | $ 0 |  |
Investment impairment charges |  | $ (4,449) |  |  |  | (4,678) |  |  |
Amortized cost basis in debt security |  | 9,000 |  |  | $ 9,000 | 9,000 |  |  |
Increase in the fair value of a contingent consideration |  | 1,580 |  |  |  | 2,689 |  |  |
Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Milestone achievement period | 5 years |  |  |  |  |  |  |  |
Contingent consideration | $ 25,491 | 28,200 |  |  | 28,200 | 28,200 |  |  |
Other Current Liabilities [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration |  | 13,600 |  |  | 13,600 | 13,600 |  |  |
Other Long-term Liabilities [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration |  | 14,600 |  |  | 14,600 | 14,600 |  |  |
Operating Expense [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Increase in the fair value of a contingent consideration |  |  |  |  | 2,700 |  |  |  |
Maximum [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Future milestone payments | 60,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Revenue Milestone [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Future milestone payments | $ 45,000 |  |  |  |  |  |  |  |
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 |  | 19,250 |  | 9,000 | $ 19,250 | 19,250 | 9,000 | $ 16,050 | $ 12,220
Increase in estimated fair value of the debt security |  |  |  |  |  | 3,200 |  |  |
ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Increase in previously recorded value of equity investments resulted from new measurement |  |  |  | $ 0 |  | $ 1,629 | $ 0 |  |
Bone Biologics Inc [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock, value |  |  | $ 500 |  |  |  |  |  |
Bone Biologics Inc [Member] | ASU 2016-01 [Member] | Equity Investments [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Increase in previously recorded value of equity investments resulted from new measurement |  |  | $ 1,600 |  |  |  |  |  |
Impact on remeasurement of equity investments per share before taxes included within other income or expense |  |  | $ 0.09 |  |  |  |  |  |
Bone Biologics Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Purchase of stock, shares |  |  | 25,000 |  |  |  |  |  |
Bone Biologics Inc [Member] | CommonStock and Warrants [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Investment impairment charges |  | $ 4,400 |  |  |  |  |  |  |

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