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Acquisition of Spinal Kinetics, Inc. - Additional Information (Detail) - USD ($) $ in Thousands |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 15, 2018
Business Acquisition [Line Items] |  |  |  |  |
Increase in the fair value of a contingent consideration |  |  | $ 3,069 |  |
Goodwill |  | $ 72,401 | 72,401 | $ 53,565 |
Spinal Implants [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 18,836 | 18,836 |  |
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 |  | 76,600 |  |
Milestone achievement period | 5 years |  |  |  |
Contingent consideration | $ 25,500 | 28,600 | 28,600 |  |
Goodwill | 17,182 | 18,836 | 18,836 |  |
Acquisition related costs |  |  | 3,300 | $ 800 |
Revenue from acquisition |  |  | 8,700 |  |
Net loss from Acquisition |  |  | 5,800 |  |
Spinal Kinetics [Member] | Spinal Implants [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 18,800 | 18,800 |  |
Spinal Kinetics [Member] | Operating Expense [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase in the fair value of a contingent consideration |  | $ 3,100 | $ 1,400 |  |
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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