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Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 192,000 $ 196,000  
Intangible assets, net 1,713,000   $ 1,925,000
Amortization expense per year $ 761,000    
Remaining estimated useful life 2 years 3 months    
Durasert [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net $ 1,200,000    
BioSilicon [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net $ 500,000