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Fair Value of Financial Assets and Liabilities - Financial Assets and Liabilities That Were Subject to Fair Value Measurement on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Assets:    
Cash equivalents $ 16,978 $ 6,471
Available for sale securities, fair value 95,885 34,907
Assets, Fair Value Disclosure, Total 112,863 41,378
Liabilities:    
Warrant liability 1,784 2,001
Liabilities, Fair Value Disclosure, Total 1,784 2,001
U.S. Treasury Notes [Member]
   
Assets:    
Available for sale securities, fair value 1,008 1,015
Commercial Paper [Member]
   
Assets:    
Available for sale securities, fair value 13,037 8,143
Corporate Bonds [Member]
   
Assets:    
Available for sale securities, fair value 73,853 25,749
U.S. Agency Bonds [Member]
   
Assets:    
Available for sale securities, fair value 4,537  
Certificate of Deposit [Member]
   
Assets:    
Available for sale securities, fair value 3,450  
Level 1 [Member]
   
Assets:    
Cash equivalents 16,978 6,471
Assets, Fair Value Disclosure, Total 17,986 7,486
Liabilities:    
Warrant liability      
Liabilities, Fair Value Disclosure, Total      
Level 1 [Member] | U.S. Treasury Notes [Member]
   
Assets:    
Available for sale securities, fair value 1,008 1,015
Level 1 [Member] | Commercial Paper [Member]
   
Assets:    
Available for sale securities, fair value      
Level 1 [Member] | Corporate Bonds [Member]
   
Assets:    
Available for sale securities, fair value      
Level 1 [Member] | U.S. Agency Bonds [Member]
   
Assets:    
Available for sale securities, fair value     
Level 1 [Member] | Certificate of Deposit [Member]
   
Assets:    
Available for sale securities, fair value     
Level 2 [Member]
   
Assets:    
Cash equivalents      
Assets, Fair Value Disclosure, Total 94,877 33,892
Liabilities:    
Warrant liability      
Liabilities, Fair Value Disclosure, Total      
Level 2 [Member] | U.S. Treasury Notes [Member]
   
Assets:    
Available for sale securities, fair value      
Level 2 [Member] | Commercial Paper [Member]
   
Assets:    
Available for sale securities, fair value 13,037 8,143
Level 2 [Member] | Corporate Bonds [Member]
   
Assets:    
Available for sale securities, fair value 73,853 25,749
Level 2 [Member] | U.S. Agency Bonds [Member]
   
Assets:    
Available for sale securities, fair value 4,537  
Level 2 [Member] | Certificate of Deposit [Member]
   
Assets:    
Available for sale securities, fair value 3,450  
Level 3 [Member]
   
Assets:    
Cash equivalents      
Assets, Fair Value Disclosure, Total      
Liabilities:    
Warrant liability 1,784 2,001
Liabilities, Fair Value Disclosure, Total 1,784 2,001
Level 3 [Member] | U.S. Treasury Notes [Member]
   
Assets:    
Available for sale securities, fair value      
Level 3 [Member] | Commercial Paper [Member]
   
Assets:    
Available for sale securities, fair value      
Level 3 [Member] | Corporate Bonds [Member]
   
Assets:    
Available for sale securities, fair value      
Level 3 [Member] | U.S. Agency Bonds [Member]
   
Assets:    
Available for sale securities, fair value     
Level 3 [Member] | Certificate of Deposit [Member]
   
Assets:    
Available for sale securities, fair value