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Platform Development (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Platform Development |  |
Summary of Platform Development Costs | Platform Development – Platform development costs are summarized as follows: Summary of Platform Development Costs
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | As of |
|  | September 30, 2021 |  |  | December 31, 2020 |
Platform development |  | $ | 19,497,520 |  |  | $ | 16,027,428 |
Less accumulated amortization |  |  | (11,485,813 | ) |  |  | (8,671,820 | )
Net platform development |  | $ | 8,011,707 |  |  | $ | 7,355,608 |
| Platform development costs are summarized as follows: Summary of Platform Development Costs
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
Platform development |  | $ | 16,027,428 |  |  | $ | 10,678,692 |
Less accumulated amortization |  |  | (8,671,820 | ) |  |  | (4,785,973 | )
Net platform development |  | $ | 7,355,608 |  |  | $ | 5,892,719 |
Summary of Platform Development Cost Activity | A summary of platform development activity for the nine months ended September 30, 2021 and year ended December 31, 2020 is as follows: Summary of Platform Development Cost Activity
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | As of |
|  | September 30, 2021 |  |  | December 31, 2020 |
Platform development beginning of period |  | $ | 16,027,428 |  |  | $ | 10,678,692 |
Payroll-based costs capitalized during the period |  |  | 3,016,924 |  |  |  | 3,750,541 |
Total capitalized costs |  |  | 19,044,352 |  |  |  | 14,429,233 |
Stock-based compensation |  |  | 1,347,624 |  |  |  | 1,608,995 |
Dispositions |  |  | (894,456 | ) |  |  | (10,800 | )
Platform development end of period |  | $ | 19,497,520 |  |  | $ | 16,027,428 |
| A summary of platform development activity for the years ended December 31, 2020 and 2019 is as follows: Summary of Platform Development Cost Activity
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
Platform development beginning of year |  | $ | 10,678,692 |  |  | $ | 6,833,900 |
Payroll-based costs capitalized during the year |  |  | 3,750,541 |  |  |  | 2,537,402 |
Total capitalized costs |  |  | 14,429,233 |  |  |  | 9,371,302 |
Stock-based compensation |  |  | 1,608,995 |  |  |  | 1,307,390 |
Dispositions during the year |  |  | (10,800 | ) |  |  | - |
Platform development end of year |  | $ | 16,027,428 |  |  | $ | 10,678,692 |

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