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Income Taxes | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Income Taxes | 10. Income Taxes The components of the gross deferred tax asset and related valuation allowance at December 31 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Deferred income tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforward | ​ | $ | 88,746,869 | ​ | $ | 82,784,742 | ​
Research and orphan drug credits | ​ |  | 53,152,849 | ​ |  | 51,184,585 | ​
Capitalized research costs | ​ |  | 10,748,355 | ​ |  | 7,125,276 | ​
Capitalized start-up costs | ​ |  | 532,931 | ​ |  | 726,724 | ​
Patent amortization | ​ |  | 42,541 | ​ |  | 58,010 | ​
Stock-based compensation | ​ |  | 7,324,617 | ​ |  | 7,247,715 | ​
Accrued bonus | ​ | ​ | 704,974 | ​ | ​ | 733,235 | ​
Operating lease liabilities | ​ | ​ | 222,452 | ​ | ​ | 252,777 | ​
Other | ​ | ​ | 87,097 | ​ | ​ | 210,237 | ​
Gross deferred income tax assets | ​ |  | 161,562,685 | ​ |  | 150,323,301 | ​
Valuation allowance | ​ |  | (161,351,398) | ​ |  | (149,972,514) | ​
Net deferred income tax assets | ​ |  | 211,287 | ​ |  | 350,787 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred income tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease right-of-use assets | ​ |  | (211,287) | ​ |  | (206,704) | ​
Property and equipment | ​ |  | — | ​ |  | (144,083) | ​
Gross deferred income tax liabilities | ​ |  | (211,287) | ​ |  | (350,787) | ​
Net deferred income tax asset/(liability) | ​ | $ | — | ​ | $ | — | ​
​ Based on the Company’s operating history and management’s expectation regarding future profitability, management believes the Company’s deferred tax assets will not be realizable under ASC 740, Income Taxes. Accordingly, a full valuation allowance was established as of December 31, 2023 and 2022. Effective for tax years beginning on or after January 1, 2022, pursuant to the Tax Cuts and Jobs Act of 2017, companies are required to capitalize and amortize Internal Revenue Code Section 174 research and experimental expenses paid or incurred over 5 years for research and development performed in the United States and 15 years for research and development performed outside of the United States. As a result of the Internal Revenue Code Section 174 research and experimental expense capitalization, the Company recognized a deferred tax asset for the future tax benefit of the amortization deductions with an offsetting increase in the valuation allowance on deferred tax assets. As of December 31, 2023, the Company had $322.5 million of U.S. Federal and state net operating losses, $10.9 million of research and development tax credits and $42.3 million of orphan drug tax credits available to carry forward. A portion of the net operating loss carryforwards will begin to expire in 2026, the research and development tax credits in 2024 and the orphan drug tax credit in 2033. Under current federal income tax laws, federal net operating losses incurred in 2018 and in future years may be carried forward indefinitely, but the deductibility of such federal net operating losses is limited. The Company’s tax attributes, including net operating losses and credits, are subject to any ownership changes as defined under Internal Revenue Code Sections 382 and 383. A change in ownership could affect the Company’s ability to utilize its net operating losses and credits. As of December 31, 2023, the Company does not believe that an ownership change has occurred. Any future ownership changes may cause a limitation on the Company’s ability to utilize existing tax attributes. The Company files income tax returns in the U.S. federal jurisdiction and in the State of Maryland. The Company’s federal income tax returns for tax years 2004 and after remain subject to examination by the U.S. Internal Revenue Service due to tax attributes available to be carried forward to open or future tax years. The Company’s Maryland income tax returns for the tax years 2006 and thereafter remain subject to examination by the Comptroller of Maryland. In addition, all of the net operating losses, research and development tax credit and orphan drug credit carryforwards that may be used in future years are still subject to adjustment. The Company did not have unrecognized tax benefits as of December 31, 2023 and 2022, and does not anticipate this to change significantly over the next 12 months. The Company will recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. Reconciliations between the statutory federal income tax rate and the effective income tax rate of income tax expense is as follows as of December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021 |
U.S. Federal statutory tax rate |  | 21.0 | % | 21.0 | % | 21.0 | %
State taxes |  | 6.3 |  | 6.1 |  | 5.9 | ​
Research credit |  | 0.7 |  | 0.6 |  | 0.9 | ​
Orphan drug credit |  | 4.1 |  | 4.8 |  | 6.6 | ​
Other | ​ | (1.3) | ​ | (3.9) | ​ | (0.3) | ​
Change in valuation allowance |  | (30.8) |  | (28.6) |  | (34.1) | ​
Provision for income taxes |  | — | % | — | % | — | %
​

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