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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 6,786,922 | $ 9,008,344
Capitalization of patent costs, goodwill and amortization | 332,901 | 441,076
Capitalization of acquisition costs | 43,523 | 35,264
Research and AMT credits | 1,689,883 | 1,421,251
Stock based compensation | 160,182 | 180,675
Deferred lease obligation | 182,550 | 274,164
Other timing differences | 51,314 | 41,045
Deferred Tax Assets, Gross | 9,247,275 | 11,401,819
Less valuation allowance | (9,028,241) | (11,103,399)
Total deferred tax assets | 219,034 | 298,420
Deferred tax liabilities: |  |
Fixed assets | (219,034) | (298,420)
Goodwill | (6,166) |
Total deferred tax liabilities | (225,200) | $ (298,420)
Total deferred tax liabilities | $ (6,166) |

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