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 Taxes Disclosure [Line Items]      
Provision for income taxes $ 0    
US federal and state net operating loss carryforwards expiration date 2032    
Unrecognized tax positions $ 185,961 $ 182,251 $ 174,289
D E      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 1,142,197 918,275  
G B      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 41,700,000 35,500,000  
Us Federal [Member]      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 692,153 169,410  
State And Local Jurisdiction [Member]      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards $ 690,942 $ 168,352