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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2014
Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items]            
Deferred tax benefits including income tax expense $ 5,500,000   $ 9,100,000      
Valuation allowance 88,500,000   88,500,000      
Net deferred tax assets 88,600,000   88,600,000      
Income tax benefit including discrete items 24,000 104,000 49,000 21,000    
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      
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2009 taxable year           $ 62,000