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Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Asset | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 116,896,000 | $ 105,247,000 | $ 108,942,000 | $ 102,738,000 | $ 108,537,000 | $ 98,497,000 | $ 104,075,000 | $ 98,679,000 |  | $ 433,823,000 | $ 409,788,000 | $ 396,489,000
Cumulative-effect adjustment to retained earnings |  |  |  |  |  |  |  |  |  |  |  | 604,000 |
Number of assets transferred | Asset |  |  |  |  |  |  |  |  |  | 2 |  |  |
Prepaid income taxes |  |  |  |  |  |  |  |  |  | $ 8,600,000 |  |  |
Increase (decrease) in net cash from operating activities |  |  |  |  |  |  |  |  |  |  | 53,341,000 | 44,707,000 | 43,610,000
ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
ASU 2016-16, as Amended [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |
ASU 2016-18 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in net cash from operating activities |  |  |  |  |  |  |  |  |  |  | (14,400,000) | 14,400,000 |
Musculoskeletal Transplant Foundation ("MTF") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for other research and development |  |  |  |  |  |  |  |  |  |  | 900,000 | 1,300,000 | 0
Customers and Distributors Based in Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 57,000,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Transactional foreign currency gains and (losses), including those generated from intercompany operations |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 | $ (100,000) | $ (3,500,000)

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