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 9 Months Ended 0 Months Ended 1 Months Ended
Sep. 18, 2012
item
investors
Sep. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Mar. 31, 2013
Mar. 05, 2012
Sep. 18, 2012
Minimum
Oct. 31, 2013
March 2012
Mar. 31, 2012
March 2012
Stockholders' Equity                  
Common stock sold (in shares)     22,600,000            
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001 $ 0.001      
Number of shares of common stock under warrants issued           22,600,000      
Exercise price (in dollars per share) $ 1.26         $ 1.55      
Number of investors with whom Investor Agreement entered 1                
Warrant unit price (in dollars per shares)     $ 1.11            
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            
Number of shares of common stock in each warrant     1            
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                
Proceeds from exercise of warrants   4.2           6.0  
Number of warrants exercised (in shares)               4,700,000  
Proceeds from issuance of warrants                 $ 23.1
Number of Put Options 2