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Held for Sale and Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract] |
Summary of Information Related to Assets Held For Sale and Discontinued Operations | The following table presents the financial results of discontinued operations related to DMG:
| Year ended December 31,
| 2020 |  | 2019 |  | 2018
Net revenues | $ | — |  |  | $ | 2,713,059 |  |  | $ | 4,963,792 |
Expenses | — |  |  | 2,543,865 |  |  | 4,962,686 |
Goodwill and other asset impairment charges | — |  |  | — |  |  | 41,537 |
Valuation adjustment on disposal group | — |  |  | — |  |  | 316,840 |
Income (loss) from discontinued operations before taxes | — |  |  | 169,194 |  |  | (357,271) |
Loss on sale of discontinued operations before taxes | (7,996) |  |  | (23,022) |  |  | — |
Income tax expense | 1,657 |  |  | 40,689 |  |  | 99,768 |
Net (loss) income from discontinued operations, net of tax | $ | (9,653) |  |  | $ | 105,483 |  |  | $ | (457,038) |
Reconciliation of Cash Flows | The following table presents cash flows of discontinued operations related to DMG:
| Year ended December 31,
| 2020 |  | 2019 |  | 2018
Net cash provided by operating activities from discontinued operations | $ | — |  |  | $ | 99,634 |  |  | $ | 290,684 |
Net cash used in investing activities from discontinued operations | $ | — |  |  | $ | (43,442) |  |  | $ | (57,382) |

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