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Fair Value Accounting (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Account:        
Cash and cash equivalents $ 20,687 $ 16,104 $ 9,047 $ 15,598
Restricted cash 1,482 815    
Warrant liability 122 155    
Recurring
       
Account:        
Cash and cash equivalents 20,687 16,104    
Restricted cash 1,482 815    
Warrant liability 122 155    
Recurring | Fair Value, Inputs, Level 1
       
Account:        
Cash and cash equivalents 20,687 16,104    
Restricted cash 1,482 815    
Warrant liability 0 0    
Recurring | Fair Value, Inputs, Level 2
       
Account:        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Warrant liability 122 155    
Recurring | Fair Value, Inputs, Level 3
       
Account:        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Warrant liability $ 0 $ 0