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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Deferred Tax Assets Liabilities [Line Items]      
Tax benefit recognized $ 0    
Federal research tax credit     549,000
Valuation allowance, deferred tax assets 20,214,000    
Deferred tax assets valuation allowance increase   10,241,000  
Forecast [Member]
      
Deferred Tax Assets Liabilities [Line Items]      
Expected cash refunds to be generated $ 1,600,000