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 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 31 $ 53 $ 57 $ 117