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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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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)

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