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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss carryforwards $ 4,584,606 $ 6,786,922
Capitalization of patent costs, goodwill and amortization 221,593 332,901
Capitalization of acquisition costs 84,640 43,523
Research and AMT credits 1,447,479 1,689,883
Stock based compensation 82,085 160,182
Deferred lease obligation 91,017 182,550
Other timing differences 72,787 51,314
Deferred Tax Assets, Gross 6,584,207 9,247,275
Less valuation allowance (6,453,466) (9,028,241)
Total deferred tax assets, net of allowance 130,741 219,034
Deferred tax liabilities:    
Fixed assets (104,324) (219,034)
Goodwill (34,388) (6,166)
Total deferred tax liabilities (138,712) (225,200)
Total deferred tax liabilities $ (7,971) $ (6,166)