Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Line Items]      
Valuation Allowance $ 24,875,049 $ 19,195,192  
Net change in valuation allowance related to deferred tax assets 5,679,857 4,879,978  
Change in ownership 50.00%    
Annual amount of pre-change net operating losses 417,000    
Additional unrecognized tax benefits 361,143 329,676  
Tax positions 1,241,781 880,638 550,962
Interest and penalties 0 0  
Research and Development Tax Credit [Member]
     
Income Tax Disclosure [Line Items]      
Federal research and development tax credit carryforwards 1,242,000    
Federal tax credit carryforward 2023    
Federal and State Tax [Member]
     
Income Tax Disclosure [Line Items]      
Federal and state tax net operating loss carryforwards $ 64,151,000    
Federal and state tax loss carryforward expiration date 2033