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Subsequent Events (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Jun. 05, 2012
Apr. 04, 2012
Jun. 30, 2012
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Apr. 03, 2012
Short-term Debt [Line Items]              
Convertible debt, carrying value   $ 25,000,000          
Convertible debt, effective interest rate   7.00%          
Convertible notes, conversion price per share   $ 4.85          
Convertible debt, premium as a percent over closing price             20.00%
Warrants, number of shares available to purchase 139,000 3,100,000          
Warrants, exercise price per share $ 3.59 $ 5.45          
Convertible notes and warrants, aggregate principal amount issuable       15,000,000      
Borrowed Funds 10,000,000            
Floating rate of interest 11.00%            
Prime rate, maximum 3.75%            
Borrowing capacity     9,000,000        
Change in restricted cash     8,500,000 9,093,000 (247,000) (1,602,000)  
Reduction of adverse purchase commitments liability     7,400,000        
Letter of Credit [Member]
              
Short-term Debt [Line Items]              
Borrowing capacity     9,000,000        
Change in restricted cash     8,500,000        
Reduction of adverse purchase commitments liability     $ 7,400,000