Property and Equipment - Schedule of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment	$ 32,907	$ 23,751
Less accumulated depreciation and amortization	(13,882)	(11,056)
Property and equipment, net	19,025	12,695
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	4,613	3,798
Surgical Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	27,068	19,345
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,226	$ 608