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Commitments and Contingencies - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2010
Jul. 31, 2007
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Loss Contingencies [Line Items]            
Minimum annual royalty payment         $ 250,000  
Minimum royalty obligations     $ 442,000   442,000  
Litigation and settlement obligation, Total     500,000   500,000  
Royalty obligation non-current     395,000   395,000  
Purchase obligations to suppliers for future product deliverables     2,200,000   2,200,000  
CADx Medical Systems Inc. [Member]            
Loss Contingencies [Line Items]            
Tax re-assessment received   $ 6,800,000        
Reduced tax re-assessment received $ 703,000          
Hologic [Member]            
Loss Contingencies [Line Items]            
Interest expense royalty obligation     18,000 $ 25,000 36,000 $ 50,000
Zeiss [Member]            
Loss Contingencies [Line Items]            
Interest expense royalty obligation     $ 28,000 $ 28,000 $ 56,000 $ 56,000