Quarterly report pursuant to Section 13 or 15(d)

Underwritten and Registered Direct Placement of Common Stock (Details)

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Underwritten and Registered Direct Placement of Common Stock (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2012
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Sep. 30, 2008
Jun. 30, 2011
Jun. 30, 2012
Mar. 05, 2012
Sep. 30, 2009
Sep. 23, 2008
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      
Number of shares of common stock under warrants issued         22,600,000   6,400,000      
Exercise price (in dollars per share)         $ 1.55 $ 1.54 $ 1.92      
Warrant unit price (in dollars per shares) $ 1.11 $ 14.90                
Right to purchase maximum additional number of shares of common stock under put option 19,000,000                  
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                   $ 25,000,000
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 25,000,000 32,000,000                
Proceeds from issuance of units under direct placement, net of direct transaction costs 23,100,000 29,500,000                
Net proceeds from exercise of warrants               3,100,000 500,000  
Number of warrants exercised (in shares)               3,600,000 400,000  
Proceeds from issuance of warrants     $ 966,000             $ 23,100,000
Term of warrants (in years)   5 years                
Outstanding warrants (in shares)           3,900,000