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 $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Sep. 18, 2012
item
investors
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2008
Sep. 30, 2013
Sep. 23, 2013
Mar. 31, 2013
Mar. 05, 2012
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
Stockholders' Equity                          
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) $ 1.26       $ 1.41     $ 1.55 $ 1.92        
Number of investors with whom Investor Agreement entered 1                        
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 trading days prior to the exercise of put option     30 days                    
Expenses incurred upon the exercise of warrants                         $ 1.9
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       32.0                  
Proceeds from issuance of units under direct placement, net of direct transaction costs       29.5                  
Arithmetic average of the average daily trading volumes on the exercise date (in shares)                   1,750,000      
Purchase price of additional shares determined pursuant to the Investor Agreement (in dollars per share) $ 0.94                        
Net proceeds from exercise of warrants   4.2                 3.1 0.5  
Number of warrants exercised (in shares)                     3,600,000 400,000  
Proceeds from issuance of warrants                         $ 23.1
Term of warrants       5 years                  
Number of Put Options 2                        
Outstanding warrants (in shares)         22,600,000 4,000,000