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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]          
Deferred tax benefits including income tax expense $ 3,200,000   $ 12,300,000    
Valuation allowance 91,800,000   91,800,000    
Net deferred tax assets 91,900,000   91,900,000    
Income tax benefit including discrete items 24,000 319,000 73,000 340,000  
Internal revenue code related to annual use of operating loss carry forwards     Annual use of the Company's net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period.    
Internal revenue code, cumulative change in ownership     50.00%    
Uncertain income tax position unrecognized     Less than a 50% likelihood    
Total liability for unrecognized tax benefits included other long-term liabilities     62,000   62,000
Interest benefit on uncertain tax positions 0   0    
Scenario, Forecast [Member]
          
Operating Loss Carryforwards [Line Items]          
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2009 taxable year     $ 62,000