Select Balance Sheet Details - Property and Equipment, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 90,313,000		$ 90,313,000		$ 89,839,000
Less accumulated depreciation and amortization	(63,803,000)		(63,803,000)		(61,809,000)
Property and Equipment, net	26,510,000		26,510,000		28,030,000
Depreciation	2,900,000	3,700,000	9,200,000	10,900,000
Surgical instruments [Member]
Property, Plant and Equipment [Line Items]
Useful lives			4 years
Property and Equipment, Gross	63,019,000		63,019,000		62,636,000
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives			7 years
Property and Equipment, Gross	15,461,000		15,461,000		14,692,000
Capital Leased Assets, Gross	3,200,000		3,200,000		1,800,000
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives			3 years
Property and Equipment, Gross	3,193,000		3,193,000		3,357,000
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives			5 years
Property and Equipment, Gross	3,823,000		3,823,000		3,703,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Various Useful lives of property and equipments			various
Property and Equipment, Gross	3,719,000		3,719,000		4,161,000
Building [Member]
Property, Plant and Equipment [Line Items]
Useful lives			39 years
Property and Equipment, Gross	72,000		72,000		52,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	10,000		10,000		10,000
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	1,016,000		1,016,000		1,228,000
Capital Leased Assets, Gross					$ 600,000