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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
(Loss) Income from Continuing Operations Before Income Taxes | Loss before income taxes consisted of the following components (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2023 |  | 2022
United States | ​ | $ | (68,182) | ​ | $ | (32,228)
Foreign | ​ |  | (863) | ​ |  | (4,689)
Total | ​ | $ | (69,045) | ​ | $ | (36,917)
Reconciliation of Statutory to Effective Tax Rates | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2023 |  | 2022 |
U.S. federal statutory income tax rate |  | 21.0 | % | 21.0 | %
Adjustments for tax effects of: | ​ | ​ | ​ | ​ | ​
State income taxes, net of federal tax | ​ | 2.9 | % | 7.3 | %
Stock-based compensation | ​ | (1.6) | % | (0.2) | %
Change in valuation allowance | ​ | (9.3) | % | (28.6) | %
Debt extinguishment | ​ | (1.2) | % | 0.0 | %
Change in rate | ​ | (3.3) | % | 0.0 | %
Fair value adjustment on convertible debt | ​ | (6.6) | % | 0.0 | %
Other | ​ | (1.9) | % | 0.5 | %
Effective income tax rate |  | (0.0) | % | 0.0 | %
Components of Deferred Tax Assets | Significant components of the Company’s deferred tax assets and liabilities were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 46,591 | ​ | $ | 42,525
Capitalized research and development | ​ |  | 21,431 | ​ |  | 19,103
Stock-based compensation | ​ |  | 2,083 | ​ |  | 3,192
Depreciation and amortization | ​ | ​ | 856 | ​ | ​ | 929
Lease accounting | ​ | ​ | 13,899 | ​ | ​ | 13,660
Other | ​ |  | 1,907 | ​ |  | 1,452
Total deferred tax assets before valuation allowance | ​ | ​ | 86,767 | ​ |  | 80,861
Less: valuation allowance | ​ |  | (75,166) | ​ |  | (68,818)
Total deferred tax assets after valuation allowance | ​ | ​ | 11,601 | ​ | ​ | 12,043
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ | ​ |  | ​ | ​ |
Right-of-use asset | ​ | ​ | (11,510) | ​ | ​ | (12,043)
In-process research and development | ​ | ​ | (3,077) | ​ | ​ | (3,077)
Other | ​ | ​ | (91) | ​ | ​ | -
Total deferred tax liabilities | ​ | ​ | (14,678) | ​ | ​ | (15,120)
Net deferred tax liability | ​ | $ | (3,077) | ​ | $ | (3,077)
​ | ​ | ​ | ​ | ​ | ​ | ​

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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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