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Segment and Enterprise Wide Disclosures - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Segment
Sep. 30, 2014
USD ($)
Sep. 21, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]          
Number of business segments | Segment   1      
Goodwill   $ 116,054,000     $ 93,842,000
Sales $ 61,000   $ 267,000    
ALF-X Surgical Robotic System Acquisition [Member]          
Segment Reporting Information [Line Items]          
Goodwill       $ 22,315,000  
U.S. [Member]          
Segment Reporting Information [Line Items]          
Percentage of total consolidated assets   57.00%      
Europe [Member] | ALF-X Surgical Robotic System Acquisition [Member]          
Segment Reporting Information [Line Items]          
Goodwill   $ 115,600,000      
International [Member]          
Segment Reporting Information [Line Items]          
Percentage of total consolidated assets, excluding goodwill   35.00%      
Sales   $ 0 $ 0