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v3.19.2

Accounts payable, accrued expenses and other liabilities | 6 Months Ended
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Jun. 30, 2019
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, 2019 and December 31, 2018:
| June 30, 2019 |  | December 31, 2018
Accounts payable, accrued expenses and other | $ | 245,781 |  |  | $ | 296,523 |
Deferred revenue | 402,007 |  |  | 421,542 |
Accrued interest | 254,834 |  |  | 262,559 |
Derivative liabilities (Note 10) | 103,778 |  |  | 29,321 |
Operating lease liabilities (Note 15) | 54,445 |  |  | — |
| $ | 1,060,845 |  |  | $ | 1,009,945 |

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