Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Components of Property and Equipment (Details)

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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 7,800 $ 19,048
Less: accumulated depreciation (6,911) (16,576)
Property and equipment, net 889 2,472
Manufacturing and Lab Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 223 7,463
Surgical Instruments [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 5,269 8,672
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 863 1,439
Software and Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 816 845
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 629 $ 629