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Long Term Debt (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Jun. 21, 2010
Senior Secured Convertible Notes due June 21, 2013
     
Long Term Debt Maturities Repayments Of Principal [Line Items]      
Long term debt, discount $ 0 $ 1,648 $ 813
Convertible Note
     
Long Term Debt Maturities Repayments Of Principal [Line Items]      
Long term debt, discount $ 980 $ 0