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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Taxes |
Schedule of components of income taxes | For the years ended December 31, 2022 and 2021, the Company’s provision for income tax consisted of (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021
Current: | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | — | ​ | $ | —
State | ​ | ​ | 14 | ​ | ​ | 4
Foreign | ​ | ​ | — | ​ | ​ | —
Total Current | ​ | $ | 14 | ​ | $ | 4
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | — | ​ | $ | —
State | ​ | ​ | — | ​ | ​ | —
Foreign | ​ | ​ | — | ​ | ​ | —
Total Deferred | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Provision for income taxes | ​ | $ | 14 | ​ | $ | 4
​
Schedule of reconciliation of statutory federal income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ |  | 2022 |  | 2021 |
Tax at statutory federal rate | ​ | 21.0 | % | 21.0 | %
State taxes, net of federal benefit | ​ | 1.9 | ​ | 1.8 | ​
Stock-based compensation | ​ | 4.2 | ​ | 4.7 | ​
IRC section 162(m) limitation | ​ | 1.1 | ​ | — | ​
Change in valuation allowance | ​ | (28.0) | ​ | (27.5) | ​
Other | ​ | — | ​ | 0.1 | ​
Provision for income taxes | ​ | 0.2 | % | 0.1 | %
​
Schedule of tax effects of temporary differences and carryforwards | The tax effects of temporary differences and carryforwards that give rise to significant portions of the deferred tax assets are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 27,110 | ​ | $ | 30,658
Inventory | ​ | ​ | 273 | ​ | ​ | 278
Accruals | ​ | ​ | 737 | ​ | ​ | 801
Depreciation and amortization | ​ | ​ | 27 | ​ | ​ | 240
Research and experimental expenditures | ​ | ​ | 2,229 | ​ | ​ | —
Stock-based compensation | ​ | ​ | 270 | ​ | ​ | 177
Right of use liability | ​ | ​ | 1,477 | ​ | ​ | 206
Gross deferred tax assets | ​ | ​ | 32,123 | ​ | ​ | 32,360
Valuation allowance | ​ | ​ | (30,328) | ​ | ​ | (32,047)
Deferred tax assets | ​ | ​ | 1,795 | ​ | ​ | 313
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Right of use asset | ​ | ​ | (1,463) | ​ | ​ | (209)
Other | ​ | ​ | (332) | ​ | ​ | (104)
Deferred tax liabilities | ​ | ​ | (1,795) | ​ | ​ | (313)
Net deferred tax assets | ​ | $ | — | ​ | $ | —
​
Schedule of changes in the Company's gross unrecognized tax benefits | A summary of changes in the Company’s gross unrecognized tax benefits for the years ended December 31, 2022 and 2021 was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021
Unrecognized tax expense, beginning of the year | ​ | $ | 105 | ​ | $ | 104
Decrease related to prior year tax positions | ​ | ​ | (16) | ​ | ​ | (12)
Increase related to current year tax positions | ​ | ​ | 16 | ​ | ​ | 13
Unrecognized tax expense, end of year | ​ | $ | 105 | ​ | $ | 105
​

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