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Accounts Receivable
 3 Months Ended
Jun. 30, 2012
Accounts Receivable [Abstract]  
Accounts Receivable

5. Accounts Receivable

Accounts receivable at June 30, 2012 and March 31, 2012 consisted of the following (in thousands):

    June 30,     March 31,  
    2012     2012  
Accounts receivable (billed) $ 11,442   $ 16,240  
Accounts receivable (unbilled)   2,168     2,811  
Less: Allowance for doubtful accounts   (52 )   (52 )
Accounts receivable, net $ 13,558   $ 18,999