Select Balance Sheet Details - Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 89,395	$ 82,719
Less accumulated depreciation and amortization	(59,880)	(52,316)
Property and Equipment, net	29,515	30,403
Surgical instruments [Member]
Property, Plant and Equipment [Line Items]
Useful lives	4 years
Property and Equipment, Gross	63,119	56,712
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives	7 years
Property and Equipment, Gross	14,630	13,996
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Property and Equipment, Gross	3,352	3,269
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Property and Equipment, Gross	3,714	3,528
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Various Useful lives of property and equipments	various
Property and Equipment, Gross	4,177	4,092
Building [Member]
Property, Plant and Equipment [Line Items]
Useful lives	39 years
Property and Equipment, Gross	56	64
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	11	13
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 336	$ 1,045