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License and Consulting Agreements - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 12, 2013 | Dec. 15, 2010 | Sep. 30, 2015 | Aug. 31, 2014 | Oct. 31, 2013 | Nov. 30, 2012 | Nov. 30, 2010 | Sep. 30, 2010 | Jan. 31, 2010 | Jun. 30, 2009 | Feb. 28, 2009 | Dec. 31, 2007 | Sep. 30, 2014 | Dec. 31, 2010 | Sep. 30, 2010 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate, amended |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty obligation per year |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty accrual reversal |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,716 | $ 78,001 |
Amortization of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,100 | 6,200 | $ 11,600
Provision for excess and obsolete inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,156 | 3,539 | 11,652
Payments to acquire asset agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 750
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 102 | 0
Issuance of common stock for acquired technology (less than $1.0 million) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 102 |
OsseoScrew License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  | $ 1,500 |  |  |  |  | $ 3,600 |  |  |  |  |  |
Additional milestone payments | $ 300 |  |  |  |  |  |  |  |  |  |  | $ 2,500 |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  | $ 1,000 |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |  |
Intangible assets, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Number of shares of Common stock |  | 452,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of accrual for milestone payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600
License Agreement with Helix Point, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  | $ 200 |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |
Distribution Agreement with Parcell Spine, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional milestone payments |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  | $ 500 |  |  |
Intangible assets, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |
Amortization of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900
Provision for excess and obsolete inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600
Distribution Agreement with Parcell Spine, LLC [Member] | Research and Development Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Distribution Agreement with Parcell Spine, LLC [Member] | Development Milestone Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Addition in intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |
License Agreement with R Tree Innovations LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  | $ 200 | $ 200 |  | 500 |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 500 | 500 |  | 1,300 |  |  |  |  |  |  | $ 1,300 |  |  |
Cash payment |  |  |  |  | $ 300 | $ 300 |  | $ 800 |  |  |  |  |  |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of Common stock |  |  |  |  |  | 367,044 |  |  |  |  |  |  |  |  |  |  |  |
Asset Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for asset agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |
Stock issued for asset agreement, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,992 |
Payments to acquire asset agreement |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 | $ 300 |
Issuance of common stock for acquired technology, shares |  |  | 72,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for acquired technology (less than $1.0 million) |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for asset agreement, shares |  |  |  |  |  |  |  |  |  | 260,000 |  |  |  |  |  |  |  |

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