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Business Segment Information - Summary of Non-GAAP Net Margin by Reporting Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Non-GAAP net margin $ 37,183 $ 35,294 $ 71,477 $ 66,919
General and administrative 22,268 20,409 41,752 38,691
Research and development 7,891 6,887 14,828 14,311
Operating income 7,024 7,998 14,897 13,917
Interest income (expense), net (251) 76 (434) 121
Other income (expense), net (4,752) 585 (1,840) (3,763)
Income before income taxes 2,021 8,659 12,623 10,275
Operating Segments [Member] | BioStim [Member]        
Segment Reporting Information [Line Items]        
Non-GAAP net margin 21,298 19,469 40,244 36,602
Operating Segments [Member] | Biologics [Member]        
Segment Reporting Information [Line Items]        
Non-GAAP net margin 6,247 6,470 12,327 12,641
Operating Segments [Member] | Extremity Fixation [Member]        
Segment Reporting Information [Line Items]        
Non-GAAP net margin 7,002 6,766 15,160 13,178
Operating Segments [Member] | Spine Fixation [Member]        
Segment Reporting Information [Line Items]        
Non-GAAP net margin 2,887 2,696 4,148 4,703
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Non-GAAP net margin (251) (107) (402) (205)
Material Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
General and administrative 22,268 20,409 41,752 38,691
Research and development $ 7,891 $ 6,887 $ 14,828 $ 14,311