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Select Condensed Consolidated Balance Sheet Details - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]    
Property and equipment, gross $ 67,987 $ 67,045
Less accumulated depreciation and amortization (55,692) (54,375)
Property and equipment, net $ 12,295 12,670
Surgical instruments    
Condensed Balance Sheet Statements Captions [Line Items]    
Useful lives 4 years  
Property and equipment, gross $ 53,372 53,198
Machinery and equipment    
Condensed Balance Sheet Statements Captions [Line Items]    
Useful lives 7 years  
Property and equipment, gross $ 6,034 5,503
Computer equipment    
Condensed Balance Sheet Statements Captions [Line Items]    
Useful lives 3 years  
Property and equipment, gross $ 3,813 3,500
Office furniture and equipment    
Condensed Balance Sheet Statements Captions [Line Items]    
Useful lives 5 years  
Property and equipment, gross $ 2,911 2,794
Leasehold improvements    
Condensed Balance Sheet Statements Captions [Line Items]    
Various useful lives of leasehold improvements various  
Property and equipment, gross $ 1,765 1,714
Construction in progress    
Condensed Balance Sheet Statements Captions [Line Items]    
Property and equipment, gross $ 92 $ 336