Balance Sheet Details - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 89,839	$ 82,719
Less accumulated depreciation and amortization	(61,809)	(52,316)
Property and equipment, net	28,030	30,403
Surgical instruments [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years
Property, Plant and Equipment, Gross	62,636	56,712
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Property, Plant and Equipment, Gross	14,692	13,996
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Property, Plant and Equipment, Gross	3,357	3,269
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Property, Plant and Equipment, Gross	3,703	3,528
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Various useful life of property and equipment	various
Property, Plant and Equipment, Gross	4,161	4,092
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Property, Plant and Equipment, Gross	52	64
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	10	13
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,228	$ 1,045