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Acquisition of Spinal Kinetics, Inc. - Additional Information (Detail) - USD ($) $ in Thousands |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Mar. 15, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
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 |  |  |  |  |
Future milestone payments | 60,000 |  |  |  |  |
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 | 26,600 | 26,600 | 26,600 |  |
Goodwill | 17,182 |  |  |  |  |
Acquisition related costs |  |  | 1,500 | 3,000 |  |
Reveneue from acquisition |  |  | 2,300 | 2,300 |  |
Net loss from Acquisition |  |  | $ 1,800 | $ 1,800 |  |
Spinal Kinetics [Member] | Spine Fixation [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 17,200 |  |  |  |  |
Spinal Kinetics [Member] | Other Expense [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase in the fair value of a contingent consideration |  | $ 1,100 |  |  |  |
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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