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Income Taxes | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Income Taxes | (9) Income Taxes Our net income tax provision, including both current and deferred, related to U.S. federal and state income taxes, is zero. 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, 2019 and 2018 is as follows:
|  | 2019 |  |  | 2018 |
Income tax credit at statutory rates |  | $ | (631 | ) |  | $ | (437 | )
Nondeductible expenses |  |  | 3 |  |  |  | 4 |
State income tax, net of federal benefits |  |  | (226 | ) |  |  | (156 | )
Expiration of NOL & Credits |  |  | 1,530 |  |  |  | 1,559 |
Tax basis in excess of book Convertible Debt |  |  | 342 |  |  |  | 0 |
Expiration of Stock Options |  |  | 125 |  |  |  | 179 |
Other |  |  | 0 |  |  |  | 0 |
Change in valuation allowance |  |  | (1,143 | ) |  |  | (1,149 | )
|  | $ | — |  |  | $ | — |
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, |
|  | 2019 |  |  | 2018 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Excess tax basis convertible debt |  | $ | (334 | ) |  | $ | — |
Total deferred tax liabilities |  |  | (334 | ) |  |  | — |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 21,912 |  |  | $ | 22,560 |
Inventory and other allowances |  |  | 14 |  |  |  | 35 |
Charitable contribution carryforwards |  |  | 1 |  |  |  | 2 |
Excess (tax) book depreciation |  |  | 451 |  |  |  | 524 |
Excess (tax) book amortization |  |  | 59 |  |  |  | 57 |
Share-based compensation |  |  | 693 |  |  |  | 749 |
Other accrued costs |  |  | 127 |  |  |  | 141 |
Total deferred tax assets |  |  | 23,257 |  |  |  | 24,068 |
Less: Valuation allowance |  |  | (22,923 | ) |  |  | (24,068 | )
Deferred income taxes |  | $ | — |  |  | $ | — |
The valuation allowance decreased approximately $1.1 million and $1.1 million for the years ended December 31, 2019 and 2018, respectively (net of approximately $1.5 million and $1.6 million for the years ended December 31, 2019 and 2018, respectively, for expiring net operating loss carryforwards and credits) 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. Management believes that significant uncertainty exists surrounding the recoverability of deferred tax assets due to our recurring losses. As a result, the Company has recorded a full valuation allowance against our net deferred tax assets. 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, 2019, the amounts subject to limitations have not yet been determined. We have net operating loss carryforwards for tax purposes of approximately $77 million on December 31, 2019. $72 million expire between 2020 and 2037. All net operating loss carryforwards generated after January 1, 2018 do not expire. Therefore, $5 million in net operating losses generated since January 1, 2018 do not expire.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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