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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Summary of Loss Before Income Taxes | Loss before income taxes are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Losses before income taxes: |  |  |  |  |  |  |  |
U.S. |  | $ | (23,408 | ) |  | $ | (16,174 | )
Non-U.S. |  |  | 193 |  |  |  | 163 |
Total |  | $ | (23,215 | ) |  | $ | (16,011 | )
Summary of Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Current: |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |
State |  |  | — |  |  |  | — |
Foreign |  |  | — |  |  |  | — |
|  |  | — |  |  |  | — |
Deferred: |  |  |  |  |  |  |  |
Federal |  |  | (404 | ) |  |  | — |
State |  |  | — |  |  |  | — |
Foreign |  |  | — |  |  |  | — |
|  |  | (404 | ) |  |  | — |
Provision (benefit) for income taxes |  | $ | (404 | ) |  | $ | — |
Reconciliation of U.S. Federal Statutory Income Tax Rate | A reconciliation of the U.S. federal statutory income tax rate to the Company’s effective income tax rate is as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Statutory Federal income tax rate |  | $ | (4,875 | ) |  | $ | (3,362 | )
Tax credits |  |  | (215 | ) |  |  | (207 | )
Change in warrant fair market value |  |  | 1,014 |  |  |  | — |
Stock-based compensation |  |  | 252 |  |  |  | 141 |
Goodwill impairment |  |  | — |  |  |  | 392 |
Permanent items |  |  | 627 |  |  |  | 4 |
Section 382 limitation on net operating losses and credits |  |  | 10,562 |  |  |  | — |
Other |  |  | 89 |  |  |  | 38 |
Change in valuation allowance |  |  | (7,858 | ) |  |  | 2,994 |
Total provision (benefit) for income taxes |  | $ | (404 | ) |  | $ | — |
Schedule of Significant Components Deferred Tax Assets and Liabilities | Significant components of the Company’s deferred tax assets and liabilities as of December 31, 2020 and 2019 consisted of the following (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Net operating loss carryforwards |  | $ | 5,151 |  |  | $ | 9,947 |
Research and development tax credits |  |  | 705 |  |  |  | 506 |
Accruals and reserves |  |  | 14 |  |  |  | 43 |
Stock compensation |  |  | 802 |  |  |  | 391 |
Depreciation and amortization |  |  | 1,905 |  |  |  | 116 |
Lease liability |  |  | 30 |  |  |  | 68 |
Total deferred tax assets |  |  | 8,607 |  |  |  | 11,071 |
Right-of-use asset |  |  | (29 | ) |  |  | (66 | )
Acquired IPR&D |  |  | (6,801 | ) |  |  | — |
Total deferred tax liabilities |  |  | (6,830 | ) |  |  | (66 | )
Less: valuation allowance |  |  | (5,883 | ) |  |  | (11,005 | )
Net deferred tax liabilities |  | $ | (4,106 | ) |  | $ | — |
Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits | The following table reconciles the beginning and ending amounts of unrecognized tax benefits for the years presented (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Gross unrecognized tax benefits at the beginning of the year |  | $ | 548 |  |  | $ | 328 |
Additions from tax positions taken in the current year |  |  | 233 |  |  |  | 214 |
Additions from tax positions taken in prior years |  |  | 531 |  |  |  | 6 |
Reductions from tax positions taken in prior years |  |  | (548 | ) |  |  | — |
Tax settlements |  |  | — |  |  |  | — |
Gross unrecognized tax benefits at the end of the year |  | $ | 764 |  |  | $ | 548 |

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