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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Schedule Of Income Taxes [Line Items]      
State net operating carry forwards $ 39,800,000    
Expiration period for net operating loss carry forwards 2013 through 2033    
Research and development credit carry forwards 4,171,000 3,688,000  
Expiration period for credit carry forwards 2016 through 2033    
Net operating loss carryforwards 68,141,000 73,087,000  
Net change in valuation allowance 5,000,000 924,000 670,000
Unrecognized Deferred tax liabilities 4,500,000    
Unrecognized tax benefit amount, if recognized 394,000 394,000 0
Federal
     
Schedule Of Income Taxes [Line Items]      
Federal net operating carry forwards 193,900,000    
Federal Research And Development Credits
     
Schedule Of Income Taxes [Line Items]      
Research and development credit carry forwards 2,200,000    
California
     
Schedule Of Income Taxes [Line Items]      
Research and development credit carry forwards 3,000,000    
U K Operating Credits
     
Schedule Of Income Taxes [Line Items]      
Net operating loss carryforwards $ 6,900,000