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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ (41,000) $ 226,000    
Federal alternative minimum tax expense 4,000 260,000    
Milestone payment received upon an FDA approval of ILUVIEN       $ 25,000,000
Foreign current income tax benefit 45,000 34,000    
Unrecognized tax benefits 0 $ 0    
Accrued penalties or interest related to uncertain tax positions $ 0   $ 0