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Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Property, Plant and Equipment [Line Items]      
Equipment $ 567   $ 1,310
Furniture & fixtures 675   484
Leasehold improvements 15   184
Property, Plant and Equipment, Gross, Total 1,257   1,978
Accumulated depreciation (827)   (1,777)
Net Property and Equipment $ 430 $ 148 $ 201