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Income Taxes | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Income Taxes | (8) Income Taxes Our net income tax provision, including both current and deferred, related to U.S. federal and state income taxes, is none. A reconciliation of income tax expense to the amount computed by applying the Federal income tax rate to loss before provision for income taxes as of December 31, 2016 and 2015 is as follows:
|  | 2016 |  |  | 2015 |
Income tax credit at statutory rates |  | $ | (436 | ) |  | $ | (405 | )
Nondeductible expenses |  |  | 2 |  |  |  | 3 |
State income tax, net of federal benefits |  |  | (66 | ) |  |  | (61 | )
Other |  |  | 144 |  |  |  | (3 | )
Increase in valuation allowance |  |  | 356 |  |  |  | 466 |
|  | $ | — |  |  | $ | — |
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred income taxes consist of the following:
|  | As of December 31, |
|  | 2016 |  |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 31,935 |  |  | $ | 31,590 |
Inventory and other allowances |  |  | 16 |  |  |  | 28 |
Charitable contribution carryforwards |  |  | 5 |  |  |  | 6 |
Excess (tax) book depreciation |  |  | 805 |  |  |  | 709 |
Excess (tax) book amortization |  |  | 69 |  |  |  | 67 |
Share-based compensation |  |  | 1,328 |  |  |  | 1,396 |
Other accrued costs |  |  | 219 |  |  |  | 225 |
Total deferred tax assets |  |  | 34,377 |  |  |  | 34,021 |
Less: Valuation allowance |  |  | (34,377 | ) |  |  | (34,021 | )
Deferred income taxes |  | $ | — |  |  | $ | — |
The valuation allowance increased approximately $0.4 million and $0.5 million for the years ended December 31, 2016 and 2015, respectively (with no expiring net operating loss carryforwards and credits for either period; a portion of the charitable contribution carryforward expired during 2016) due principally to the change in the net operating loss carryforward and uncertainty as to whether future taxable income will be generated prior to the expiration of the carryforward period. Under the Internal Revenue Code, certain ownership changes, including the prior issuance of preferred stock and our public offering of common stock, may subject us to annual limitations on the utilization of our net operating loss carryforward. As of December 31, 2016, the amounts subject to limitations has not yet been determined. We have net operating loss carryforwards for tax purposes of approximately $82 million on December 31, 2016, which expire between 2018 and 2036. During 2011, the state of Illinois suspended the use of net operating loss carryforwards for a four year period beginning 2011, extending the term of all net loss carryforwards by a corresponding four years.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: 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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