Quarterly report pursuant to sections 13 or 15(d)

Property and Equipment - Additional Information (Detail)

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Property and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 27 $ 45 $ 83 $ 160