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Acquisition of Spinal Kinetics, Inc. - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 5 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Mar. 15, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Increase in the fair value of a contingent consideration |  | $ 1,580 |  | $ 2,689 |  |
Goodwill |  | 70,747 | $ 70,747 | 70,747 |  | $ 53,565
Spinal Kinetics [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition date | Apr. 30, 2018 |  |  |  |  |
Business acquisition conversion of shares into net cash subject to adjustments | $ 45,000 |  |  |  |  |
Business acquisition, percentage of outstanding stock |  |  |  |  | 100.00% |
Fair value of the consideration transferred | $ 76,055 |  |  |  |  |
Milestone achievement period | 5 years |  |  |  |  |
Contingent consideration | $ 25,491 | 28,200 | 28,200 | 28,200 |  |
Goodwill | 17,182 |  |  |  |  |
Acquisition related costs |  | 300 |  | 3,300 |  |
Revenue from acquisition |  | 2,900 |  | 5,200 |  |
Net loss from Acquisition |  | $ 2,100 |  | $ 3,500 |  |
Spinal Kinetics [Member] | Spinal Implants [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 17,200 |  |  |  |  |
Spinal Kinetics [Member] | Operating Expense [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase in the fair value of a contingent consideration |  |  | $ 2,700 |  |  |
Spinal Kinetics [Member] | US Food And Drug Administration [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Future milestone payments | 15,000 |  |  |  |  |
Spinal Kinetics [Member] | Revenue Milestone [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Future milestone payments | 45,000 |  |  |  |  |
Spinal Kinetics [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Future milestone payments | $ 60,000 |  |  |  |  |

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