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Acquisitions - Additional Information (Detail) - USD ($) shares in Millions |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Apr. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Feb. 06, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 71,177,000 |  |  | $ 72,401,000
Consideration for the asssets acquired | $ 6,400,000 |  |  |  |  |
Options Medical Founder [Member] |  |  |  |  |  |
Business Acquisition [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 rights of RSUs | 33.33% |  |  |  |  |
Spinal Kinetics [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition date |  | Apr. 30, 2018 |  |  |  |
Business acquisition conversion of shares into net cash subject to adjustments |  | $ 45,000,000.0 |  |  |  |
Fair value of the consideration transferred |  | 76,600,000 |  |  |  |
Goodwill |  | 17,612,000 |  |  |  |
Acquisition related costs |  |  | 0 | $ 1,500,000 |  |
Revenue from acquisition |  |  | 3,100,000 |  |  |
Net loss from Acquisition |  |  | $ 4,000,000.0 |  |  |
Spinal Kinetics [Member] | Global Spine [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 17,600,000 |
Spinal Kinetics [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Future milestone payments |  | $ 60,000,000.0 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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