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Accounts Payable and Accrued Expenses | 6 Months Ended
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Jun. 30, 2021
Accounts Payable and Accrued Expenses |
Accounts Payable and Accrued Expenses | (4) Accounts Payable and Accrued Expenses Accounts payable and accrued expenses consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Professional fees | ​ | $ | 840,455 | ​ | $ | 193,281
Consulting fees | ​ |  | 76,507 | ​ |  | 80,012
Research and development billings | ​ |  | 238,185 | ​ |  | 51,806
State filing and other fees | ​ |  | 1,397 | ​ |  | 1,778
Accrued license payments | ​ |  | 59,957 | ​ |  | 42,300
​ | ​ | $ | 1,216,501 | ​ | $ | 369,177
​ See Note 6 for further information regarding the accrued license payments.

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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