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Income Taxes - Summary of Effects of Temporary Differences that Give Rise to Significant Portions of the Deferred Tax Assets (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforwards $ 8,359,000 $ 10,433,000
Stock-based compensation 1,897,000 1,871,000
License agreements 268,000  
Research and development 117,000  
Technology licensing fee 185,000 167,000
Total deferred tax assets 10,826,000 12,471,000
Valuation allowance (10,826,000) (12,471,000)
Deferred tax assets, net of valuation allowance $ 0 $ 0