Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

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Property and Equipment - Additional Information (Detail) (Furniture, fixtures, and equipment [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Furniture, fixtures, and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Furniture, fixtures and equipment, net book value $ 39 $ 160