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v3.21.2

Accounts payable, accrued expenses and other liabilities | 6 Months Ended
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Jun. 30, 2021
Payables and Accruals [Abstract] |
Accounts payable, accrued expenses and other liabilities | Accounts payable, accrued expenses and other liabilities Accounts payable, accrued expenses and other liabilities consisted of the following as of June 30, 2021 and December 31, 2020:
| June 30, 2021 |  | December 31, 2020
Deferred revenue | $ | 306,250 |  |  | $ | 399,820 |
Accrued interest | 289,621 |  |  | 270,576 |
Accounts payable and accrued expenses | 281,255 |  |  | 222,203 |
Derivative liabilities (Note 9) | 123,608 |  |  | 167,303 |
Operating lease liabilities | 41,685 |  |  | 49,423 |
| $ | 1,042,419 |  |  | $ | 1,109,325 |

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