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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 4,924,181 | $ 4,584,606
Capitalization of patent costs, goodwill and amortization | 247,239 | 221,593
Capitalization of acquisition costs | 81,088 | 84,640
Research and AMT credits | 2,074,363 | 1,447,479
Stock based compensation | 326,755 | 82,085
Deferred lease obligation | 63,946 | 91,017
Accrued bonuses | 198,102 |
Other timing differences | 60,773 | 72,787
Deferred Tax Assets, Gross | 7,976,447 | 6,584,207
Less valuation allowance | (7,658,670) | (6,453,466)
Total deferred tax assets, net of allowance | 317,777 | 130,741
Deferred tax liabilities: |  |
Fixed assets | (192,673) | (104,324)
Goodwill | (162,681) | (34,388)
Total deferred tax liabilities | (355,354) | (138,712)
Total deferred tax liabilities | $ (37,577) | $ (7,971)

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