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Summary of Prepaid Expenses and Other Current Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Prepaid Expenses And Other Current Assets [Line Items]    
Prepaid insurance $ 303 $ 155
Other prepaid expenses and vendor advances 2,099 3,479
Inventory   57
Accrued interest income 10 276
Total prepaid expenses and other current assets $ 2,412 $ 3,967