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Balance Sheet Details - Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 93,257	$ 90,458
Less accumulated depreciation and amortization	(71,312)	(64,418)
Property and equipment, net	$ 21,945	26,040
Surgical instruments [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years
Property and equipment, total	$ 65,723	62,872
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Property and equipment, total	$ 15,520	15,382
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Property and equipment, total	$ 3,984	3,180
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Property and equipment, total	$ 3,746	3,789
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Various useful life of property and equipment	various
Property and equipment, total	$ 3,856	3,841
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Property and equipment, total	$ 65	65
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, total	9	9
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 354	$ 1,320

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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