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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The effective tax rate of our provision (benefit) for income taxes differs from the Federal statutory rate as follows:
|  |  | Year Ended December 31,
|  |  | 2020 |  |  | 2019
Statutory rate |  |  | 21.0% |  |  | 21.0%
Net operating loss expiration |  |  | (47.5)% |  |  | (14.7)%
Tax credits |  |  | 2.2% |  |  | 2.8%
Change in valuation allowance |  |  | 24.3% |  |  | (9.1)%
Total |  |  | 0.0% |  |  | 0.0%
Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities | Deferred tax assets are summarized as follows (in thousands):
|  |  | December 31,
|  |  | 2020 |  |  | 2019
Deferred tax assets |  |  |  |  |  |
Reserves |  | $ | 647 |  | $ | 610
Net operating loss carryforwards |  |  | 83,289 |  |  | 85,282
R&D credit carryforwards |  |  | 8,836 |  |  | 9,047
Depreciation/amortization deferred |  |  | 15,862 |  |  | 16,978
Other |  |  | 5,773 |  |  | 5,808
Net deferred taxes before valuation allowance |  |  | 114,407 |  |  | 117,725
Less: Valuation allowance |  |  | (114,407) |  |  | (117,725)
Deferred tax assets |  | $ | - |  | $ | -

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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