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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
May 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Aug. 10, 2012
Sep. 30, 2013
Sep. 30, 2012
Oct. 21, 2011
Oct. 11, 2013
Subsequent Event
Oct. 31, 2013
Subsequent Event
Oct. 11, 2013
Subsequent Event
Common Stock
Oct. 11, 2013
Subsequent Event
Series C Preferred Stock
Subsequent Event [Line Items]                      
Issuance and sold of stock   1,667,051 1,825,079 2,260,869           3,071,672 46,000
Common stock, par value         $ 0.001 $ 0.001 $ 0.001     $ 5.86  
Sale of stock, price per share   $ 2.12 $ 2.26 $ 2.76             $ 1,000
Conversion price $ 1.83             $ 5.86      
Aggregate price of issuance or Sale of Equity               $ 64      
Cash from issuance of equity $ 36.0       $ 44.5     $ 60.0 $ 60.0