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Summary of Significant Accounting Policies - Additional Information (Detail)
6 Months Ended 12 Months Ended
Sep. 21, 2015
Mar. 30, 2014
shares
Jun. 30, 2016
USD ($)
Segment
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Mar. 31, 2014
$ / shares
shares
Accounting Policies [Line Items]            
Reverse stock split, ratio   0.20        
Common stock, shares issued | shares   244,276,923 115,000,003   100,180,872 48,855,255
Common stock, shares outstanding | shares   244,276,923 114,928,458   100,149,453 48,855,255
Common stock, par value (in dollars per share) | $ / shares     $ 0.001   $ 0.001 $ 0.001
Impairment charges     $ 0   $ 0  
Number of business segments | Segment     1      
Goodwill     $ 210,196,000   $ 248,602,000  
U.S. [Member]            
Accounting Policies [Line Items]            
Percentage of total consolidated assets     56.00%      
International [Member]            
Accounting Policies [Line Items]            
Percentage of total consolidated assets, excluding goodwill     35.00%      
ALF-X Surgical Robotic System Acquisition [Member]            
Accounting Policies [Line Items]            
Amortization period 7 years          
ALF-X Surgical Robotic System Acquisition [Member] | Europe [Member]            
Accounting Policies [Line Items]            
Goodwill     $ 93,200,000      
Stock Options [Member]            
Accounting Policies [Line Items]            
Share based compensation, expense recognized     $ 2,477,000 $ 1,667,000    
Minimum [Member]            
Accounting Policies [Line Items]            
Amortization period     7 years      
Maximum [Member]            
Accounting Policies [Line Items]            
Amortization period     10 years      
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]            
Accounting Policies [Line Items]            
Concentration Risk Percentage     100.00%   100.00%