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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Effective Income Tax Rate Reconciliation | The difference between income taxes expected at the U.S. federal statutory income tax rate of 21% and the reported income tax expense (benefit) are summarized as follows:
| Year Ended December 31,
2022 |  | 2021
Income tax (benefit) at statutory rate | $ | (10,685) |  |  | $ | (11,330) |
Valuation allowance | 12,894 |  |  | 11,500 |
State income tax (benefit), net of federal benefit | (2,114) |  |  | (1,978) |
Business tax credit net of reserves | (575) |  |  | (190) |
Non-deductible expenses | 794 |  |  | 2,210 |
Business combination | — |  |  | (437) |
Foreign income taxes at different rate | (310) |  |  | (201) |
Income tax expense (benefit) | $ | 4 |  |  | $ | (426) |
Effective tax rate | (0.01) | % |  | 0.79 | %
Provision Expense (Benefit) for Income Taxes | The provision expense (benefit) for income taxes consist of the following:
| Year Ended December 31,
| 2022 |  | 2021
Current: |  |  |
Federal | $ | — |  |  | $ | — |
State | 4 |  |  | 11 |
Foreign | — |  |  | — |
Total current | 4 |  |  | 11 |
Deferred: |  |  |
Federal | — |  |  | (416) |
State | — |  |  | (21) |
Foreign | — |  |  | — |
Total deferred | — |  |  | (437) |
Total income tax (benefit) expense | $ | 4 |  |  | $ | (426) |
Components of Net Deferred Income Taxes | The components of net deferred income taxes consist of the following:
| December 31,
| 2022 |  | 2021
Deferred tax assets: |  |  |
Net operating loss | $ | 47,662 |  |  | $ | 40,922 |
Unrealized loss on digital assets | 6,754 |  |  | 2,015 |
Tax credits | 1,940 |  |  | 1,416 |
Reserves and accruals | 332 |  |  | 732 |
Leases - lease liability | 1,019 |  |  | 376 |
Amortization of acquired intangibles | 2,624 |  |  | 232 |
Other deferred tax assets | 686 |  |  | 1,748 |
Gross deferred tax assets | 61,017 |  |  | 47,441 |
Less valuation allowance | (59,057) |  |  | (46,163) |
Total deferred tax assets | 1,960 |  |  | 1,278 |
Deferred tax liabilities: |  |  |
Amortization of acquired intangibles | — |  |  | — |
Leases - right of use asset | (931) |  |  | (306) |
Other deferred tax liabilities | (1,029) |  |  | (972) |
Total deferred tax liabilities | (1,960) |  |  | (1,278) |
Net deferred tax liabilities | $ | — |  |  | $ | — |
Reconciliation of Unrecognized Tax Benefits | The following is a tabular reconciliation of the total amounts of unrecognized tax benefits:
| December 31,
| 2022 |  | 2021
Unrecognized tax benefits, beginning of period | $ | 1,545 |  |  | $ | 1,314 |
Tax positions taken in prior periods: |  |  |
Gross increases | — |  |  | — |
Gross decreases | — |  |  | — |
Tax positions taken in current period: |  |  |
Gross increases | 212 |  |  | 231 |
Settlements | — |  |  | — |
Lapse of statute of limitations | — |  |  | — |
Unrecognized tax benefits, end of period | $ | 1,757 |  |  | $ | 1,545 |

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