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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes |
Schedule of differences between the carrying amount of assets and liabilities for financial reporting purposes and their respective income tax basis |
December 31 |  | 2017 |  | 2016 |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 27,578,200 |  | $ | 38,299,400 |  | $ | 33,424,100 |
Charitable contributions |  |  | 300 |  |  | 500 |  |  | 500 |
Inventory reserves |  |  | 205,800 |  |  | 361,300 |  |  | 267,700 |
Amortization |  |  | 22,800 |  |  | 89,500 |  |  | 51,400 |
Allowance for doubtful accounts |  |  | 116,900 |  |  | 102,300 |  |  | 72,300 |
Stock-based compensation |  |  | 519,900 |  |  | 341,400 |  |  | 260,600 |
Total deferred tax assets |  |  | 28,443,900 |  |  | 39,194,400 |  |  | 34,076,600 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |
Depreciation |  |  | (80,500) |  |  | (83,300) |  |  | (62,400) |
Deferred revenue |  |  | (6,400) |  |  | - |  |  | - |
Net deferred tax assets |  |  | 28,357,000 |  |  | 39,111,100 |  |  | 34,014,200 |
Valuation allowance |  | $ | (28,357,000) |  | $ | (39,111,100) |  | $ | (34,014,200) |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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