Annual report pursuant to section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Taxes [Line Items]    
Operating loss (NOL) carry-forwards $ 66,923  
Operating loss (NOL) carry-forwards expiration date Expiring in various years ranging through 2031  
Net deferred tax asset 39,927 34,325
Valuation allowance 39,927 34,325
Increase in valuation allowance $ 5,602