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Select Condensed Consolidated Balance Sheet Details - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]            
Depreciation $ 1.5 $ 1.6 $ 4.5 $ 4.8    
Amortization of intangible assets 0.2 $ 0.2 0.6 $ 0.7    
SafeOp Surgical, Inc.            
Condensed Balance Sheet Statements Captions [Line Items]            
Business acquisition, intangible assets recorded         $ 21.6  
Machinery and equipment            
Condensed Balance Sheet Statements Captions [Line Items]            
Capital leased assets, gross $ 2.1   $ 2.1     $ 2.1