Quarterly report pursuant to Section 13 or 15(d)

Underwritten and Registered Direct Placements of Common Stock (Details)

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Underwritten and Registered Direct Placements of Common Stock (Details) (USD $)
0 Months Ended 1 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Sep. 18, 2012
Sep. 30, 2012
Mar. 31, 2012
backlogunit
Sep. 30, 2008
Sep. 30, 2012
Sep. 30, 2011
Mar. 05, 2012
Sep. 30, 2009
Sep. 23, 2008
Sep. 18, 2012
Minimum
Mar. 31, 2012
Registered direct placement effective date September 23, 2008
Mar. 31, 2011
Warrants exercised on March 9, 2011
Mar. 31, 2012
March 2012 Warrants
Underwritten and Registered Direct Placement of Common Stock                          
Common stock sold (in shares)     22,600,000 21,500,000                  
Common stock, par value (in dollars per share)   $ 0.001 $ 0.001   $ 0.001   $ 0.001   $ 0.001        
Number of shares of common stock under warrants issued   9,500,000     9,500,000   22,600,000   6,400,000        
Exercise price (in dollars per share) $ 1.26 $ 1.41     $ 1.41   $ 1.55 $ 1.52 $ 1.92        
Warrant unit price (in dollars per shares)     $ 1.11 $ 14.90                  
Number of option exercise periods     2                    
Number of trading days prior to the exercise of put option     30 days                    
Proceeds from issuance of warrants, gross                         $ 23,100,000
Number of shares of common stock in each unit     1 10                  
Number of shares of common stock in each warrant     1 3                  
Gross proceeds from issuance of units under direct placement       32,000,000                  
Proceeds from issuance of units under direct placement, net of direct transaction costs       29,500,000                  
Arithmetic average of the average daily trading volumes on the exercise date (in shares)                   1,750,000      
Purchase price of additional shares, discount to the lesser of the closing bid price of the common stock and VWAP measurement for specified trading days (as a percent) 8.00%                        
Number of trading days prior to exercise of put option for VWAP measurement 10 days                        
Net proceeds from exercise of warrants   4,200,000                 3,100,000 500,000  
Number of warrants exercised (in shares)                     3,600,000 400,000  
Proceeds from issuance of warrants         $ 4,260,000 $ 1,083,000             $ 23,100,000
Term of warrants       5 years                  
Outstanding warrants (in shares)   22,600,000     22,600,000     4,000,000