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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Deferred Tax Assets Tax Credit Carry Forwards Research [Member]
Dec. 31, 2013
Scenario, Forecast [Member]
Valuation allowance $ 74,000,000   $ 74,000,000     $ 321,000  
Deferred tax benefits including income tax expense 1,300,000   10,100,000        
Net deferred tax assets 74,100,000   74,100,000        
Income tax expense (benefit), including discrete items 319,000 107,000 340,000 276,000      
Uncertain income tax (less than)     Less than a 50% likelihood        
Total liability for unrecognized tax benefits included other long-term liabilities     62,000   367,000    
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2008 taxable year             $ 71,000