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, 2015
Dec. 31, 2014
Income Taxes [Line Items]    
Provision (Benefit) for federal and state income tax $ 0  
Net operating loss carryforwards 22,416,000 $ 7,164,000
Uncertain tax position $ 0 0
Federal [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards expiration year 2029  
State and Local Jurisdiction [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards expiration year 2014  
Research [Member]    
Income Taxes [Line Items]    
Tax credit carryforwards $ 441,000 $ 190,000