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Research and Development (Tables) | 6 Months Ended
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Jun. 30, 2023
Research and Development |
Research and Development |
​ |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
​ |  |  | 2023 |  |  |  | 2022 |  |  |  | 2023 |  |  | 2022 |
Outsourced service (i) |  | $ | 20,063,536 |  |  | $ | 8,812,089 |  |  | $ | 39,500,865 |  |  | $ | 16,957,952 |
Payroll costs |  |  | 1,662,937 |  |  |  | 1,554,360 |  |  |  | 3,698,721 |  |  |  | 2,310,728 |
Other expenses |  |  | 94,782 |  |  |  | 50,829 |  |  |  | 150,007 |  |  |  | 263,285 |
Total |  | $ | 21,821,255 |  |  | $ | 10,417,278 |  |  | $ | 43,349,593 |  |  | $ | 19,531,965 |
(i) For the three months ended June 30, 2023 and 2022, $17,233,228 and $8,329,134 and for the six months ended June 30, 2023 and 2022 $32,322,056 and $15,665,298, were charged under the MSA contract, respectively. Refer to Note 5 for additional information regarding the MSA.

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