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Other Current Liabilities | 6 Months Ended
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Jun. 30, 2026
Other Current Liabilities |
Other Current Liabilities | 9. Other Current Liabilities Other current liabilities consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Payable for social security and withholding taxes | ​ | $ | 160,935 | ​ | $ | 167,893
Accrued payroll | ​ |  | 751,721 | ​ |  | 1,192,479
Accrued research and development | ​ |  | 554,443 | ​ |  | 518,856
Accrued professional fees | ​ | ​ | 388,750 | ​ | ​ | 370,662
Accrued other | ​ | ​ | 54,906 | ​ | ​ | 13,645
Tax provision | ​ | ​ | 69,689 | ​ | ​ | 43,089
Total other current liabilities | ​ | $ | 1,980,444 | ​ | $ | 2,306,624
​ Accrued payroll refers to accruals for year-end bonuses, accrued vacation, overtime and other payroll-related accruals. Tax provision refers to a tax payable due to the Spanish tax authorities related to taxable income generated in Spain.

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