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Subsequent Events - Additional Information (Detail) - USD ($) shares in Millions |  |  |  |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2019 | Feb. 14, 2019 | Jan. 31, 2019 | Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Feb. 06, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |
Changes in fair value of contingent consideration |  |  |  |  |  | $ 3,069,000 |
Spinal Kinetics [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Consideration for the asssets acquired |  |  |  | $ 76,055,000 |  | 76,600,000 |
Contingent consideration |  |  |  | 25,500,000 | $ 28,600,000 | 28,600,000 |
Spinal Kinetics [Member] | US Food And Drug Administration [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Future milestone payments |  |  |  | $ 15,000,000.0 |  |  |
Spinal Kinetics [Member] | Operating Expense [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Changes in fair value of contingent consideration |  |  |  |  | 3,100,000 | 1,400,000 |
Other Current Liabilities [Member] | Spinal Kinetics [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 13,600,000 | $ 13,600,000 |
Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Consideration for the asssets acquired |  |  | $ 6,400,000 |  |  |  |
Subsequent Event [Member] | Spinal Kinetics [Member] | US Food And Drug Administration [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Future milestone payments |  |  |  |  |  |  | $ 15,000,000.0
Payments obligation for contigent consideration |  | $ 15,000,000.0 |  |  |  |  |
Subsequent Event [Member] | Options Medical Founder |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  | 25,478 |  |  |  |
Share based compensation, grant fair value of restricted stock units |  |  | $ 1,400,000 |  |  |  |
Share based compensation, vesting period of restricted stock units |  |  | 4 months |  |  |  |
Subsequent Event [Member] | President and Chief Executive Officer [Member] | Transition and Retirement Agreement [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Share based compensation, vesting period of restricted stock units | 1 year |  |  |  |  |  |
Transition consulting services payable per month | $ 40,000 |  |  |  |  |  |
Share based compensation, grant date fair market value of restricted stock units | $ 2,000,000 |  |  |  |  |  |

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