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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of components of income tax expense | The provision for income taxes was as follows:
(in thousands) |  | Year Ended December 31,
Current: |  | 2020 |  | 2019 |  | 2018
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  | 72 |  |  | 9 |  |  | 1 |
|  | $ | 72 |  |  | $ | 9 |  |  | $ | 1 |
Deferred: |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  | — |  |  | — |  |  | — |
|  | $ | — |  |  | $ | — |  |  | $ | — |
Provision for income tax |  | $ | 72 |  |  | $ | 9 |  |  | $ | 1 |
Schedule of effective income tax rate reconciliation | A reconciliation of income tax expense from continuing operations to the amount computed by applying the statutory federal income tax rate to the net loss from continuing operations is summarized as follows:
|  | Year Ended December 31,
(in thousands) |  | 2020 |  | 2019 |  | 2018
U.S. income tax at federal statutory rate |  | $ | (11,063) |  |  | $ | (2,611) |  |  | $ | (6,276) |
State income tax, net of federal benefits |  | (1,962) |  |  | (2,550) |  |  | (1,072) |
Foreign rate differential |  | (54) |  |  | — |  |  | — |
Stock warrant liability |  | — |  |  | 2,626 |  |  | — |
Share-based compensation |  | (21,007) |  |  | (21,236) |  |  | (615) |
Research and development credits |  | (10) |  |  | (8) |  |  | (6) |
Return to provision and other |  | — |  |  | — |  |  | 29 |
Change in tax rates |  | 2,989 |  |  | 73 |  |  | 668 |
Other |  | 529 |  |  | (98) |  |  | 363 |
Change in valuation allowance |  | 30,650 |  |  | 23,813 |  |  | 6,910 |
Provision for income tax |  | $ | 72 |  |  | $ | 9 |  |  | $ | 1 |
Schedule of deferred tax assets and liabilities | A valuation allowance has been recorded to offset the net deferred tax assets as of December 31, 2020 and 2019, as the realization of such assets does not meet the more-likely-than-not threshold.
|  | December 31,
(in thousands) |  | 2020 |  | 2019
Deferred Tax Assets: |  |  |  |
Net operating loss (NOL) |  | $ | 78,464 |  |  | $ | 50,663 |
Intangibles |  | 1,495 |  |  | 1,252 |
Share-based compensation |  | 3,295 |  |  | 2,704 |
Interest |  | 311 |  |  | — |
Inventory reserve |  | 2,262 |  |  | 1,509 |
Other |  | 2,024 |  |  | 204 |
Total gross deferred tax assets |  | 87,851 |  |  | 56,332 |
Deferred Tax liabilities: |  |  |  |
Property, plant and equipment |  | 1,773 |  |  | 904 |
Other |  | — |  |  | — |
Total gross deferred tax liabilities |  | 1,773 |  |  | 904 |
Valuation allowance |  | 86,078 |  |  | 55,428 |
Net deferred tax assets (liabilities) |  | $ | — |  |  | $ | — |
Schedule of unrecognized tax benefits | The following table summarizes the activity related to the Company’s gross unrecognized tax benefits at the beginning and end of the years ended December 31, 2020 and 2019:
|  | Year Ended December 31,
|  | 2020 |  | 2019
Gross unrecognized tax benefits at the beginning of the year |  | $ | 3,336 |  |  | $ | 1,846 |
Increases related to current year positions |  | 2,063 |  |  | 1,695 |
Increases/Decreases related to prior year positions |  | — |  |  | (205) |
Gross unrecognized tax benefits at the end of the year |  | $ | 5,399 |  |  | $ | 3,336 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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