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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax [Line Items]    
Income tax expense $ 0 $ 0
Non-qualified stock options cancelled, Value 1,600,000  
Reversal of deferred tax assets 520,000  
Valuation allowance decreased amount (1,645,000) 1,265,000
Research and development tax credit carryforwards $ 117,000  
Tax credit carryforwards expiration period 2029  
Federal net operating loss carryforwards $ 24,123,000  
State NOLs $ 4,336,000  
Tax credit carryforwards expiration year end 2035  
Accrued amount for payment of interest and penalties $ 0 0
Unrecognized tax benefits $ 0 $ 0
Research and Development Tax Credit Carryforwards [Member]    
Income Tax [Line Items]    
Tax credit carryforwards expiration period 2029