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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes [Abstract] |
Schedule of Income Tax Benefit Attributable to Our Loss from Operations | Income tax benefit attributable to ARCA’s loss from operations before income taxes differs from the amounts computed by applying the U.S. federal statutory income tax rate of 21% for 2023 and 2022, as a result of the following (in thousands):
|  | Years ended December 31,
|  | 2023 |  | 2022
U.S. federal income tax benefit at statutory rates |  | $ | (1,121 | ) |  | $ | (2,085 | )
State income tax benefit, net of federal benefit |  |  | (192 | ) |  |  | (357 | )
Research and experimentation credits |  |  | — |  |  |  | — |
Deferred tax asset adjustment |  |  | 47 |  |  |  | 2 |
Other |  |  | 107 |  |  |  | 186 |
Change in valuation allowance |  |  | 1,159 |  |  |  | 2,254 |
Income tax benefit |  | $ | — |  |  | $ | — |
Schedule of Net deferred tax assets and liabilities | Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes, as well as operating loss and tax credit carryforwards. The income tax effects of temporary differences and carryforwards that give rise to significant portions of ARCA’s net deferred tax assets and liabilities consisted of the following (in thousands):
|  | As of December 31,
|  | 2023 |  | 2022
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 51,190 |  |  | $ | 50,008 |
Charitable contribution carryforwards |  |  | 371 |  |  |  | 393 |
Research and experimentation credits |  |  | 2,420 |  |  |  | 2,420 |
Capitalized research and development costs |  |  | 951 |  |  |  | 979 |
Capitalized intangibles |  |  | 354 |  |  |  | 356 |
Stock-based compensation |  |  | 232 |  |  |  | 205 |
Accrued compensation |  |  | 7 |  |  |  | 6 |
Lease liabilities |  |  | 69 |  |  |  | 94 |
Total deferred tax assets |  |  | 55,594 |  |  |  | 54,461 |
Valuation allowance |  |  | (55,531 | ) |  |  | (54,372 | )
Deferred tax assets, net of valuation allowance |  |  | 63 |  |  |  | 89 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Right-of-use asset |  |  | (61 | ) |  |  | (84 | )
Depreciation and amortization |  |  | (2 | ) |  |  | (5 | )
Net deferred tax liability |  | $ | — |  |  | $ | — |

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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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