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Cash, cash equivalents and restricted cash (Tables) | 6 Months Ended
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Jun. 30, 2021
Cash and Cash Equivalents [Abstract] |
Schedule of cash and cash equivalents | The following is a reconciliation of cash, cash equivalents and restricted cash as of June 30, 2021, December 31, 2020 and June 30, 2020:
| June 30, 2021 |  | December 31, 2020 |  | June 30, 2020
Cash and cash equivalents | $ | 1,402,918 |  |  | $ | 1,248,772 |  |  | $ | 2,382,655 |
Restricted cash | 190,447 |  |  | 246,518 |  |  | 260,466 |
Total cash, cash equivalents and restricted cash | $ | 1,593,365 |  |  | $ | 1,495,290 |  |  | $ | 2,643,121 |
Schedule of restricted cash and cash equivalents | The following is a reconciliation of cash, cash equivalents and restricted cash as of June 30, 2021, December 31, 2020 and June 30, 2020:
| June 30, 2021 |  | December 31, 2020 |  | June 30, 2020
Cash and cash equivalents | $ | 1,402,918 |  |  | $ | 1,248,772 |  |  | $ | 2,382,655 |
Restricted cash | 190,447 |  |  | 246,518 |  |  | 260,466 |
Total cash, cash equivalents and restricted cash | $ | 1,593,365 |  |  | $ | 1,495,290 |  |  | $ | 2,643,121 |

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