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Equity-Based Compensation and Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Share Based Compensation Activity | The following table summarizes the activity in the Common Series C Units during the years ended December 31, 2020, 2019 and 2018:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Beginning of the period |  |  | 174,190 |  |  |  | 156,975 |  |  |  | 150,906 |
Grants |  |  | 2,900 |  |  |  | 21,953 |  |  |  | 10,830 |
Forfeitures |  |  | (5,064 | ) |  |  | (4,738 | ) |  |  | (4,416 | )
Repurchases |  |  | — |  |  |  | — |  |  |  | (345 | )
End of the period |  |  | 172,026 |  |  |  | 174,190 |  |  |  | 156,975 |
The following table summarizes the activity in the Common Series C-2 Units during the years ended December 31, 2020, 2019 and 2018:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Beginning of the period |  |  | 33,400 |  |  |  | 33,525 |  |  |  | — |
Grants |  |  | 2,500 |  |  |  | 1,425 |  |  |  | 34,275 |
Forfeitures |  |  | (3,625 | ) |  |  | (1,550 | ) |  |  | (750 | )
End of the period |  |  | 32,275 |  |  |  | 33,400 |  |  |  | 33,525 |
Common Series C Units [Member] |
Schedule Of Assumption Used To Determine Fair Value | The following weighted average assumptions were used in determining the fair value of Common Series C Unit grants made during the years ended December 31, 2020, 2019, and 2018:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Grant date fair value |  | $ | 201.25 |  |  | $ | 37.90 |  |  | $ | 167.40 |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected volatility |  |  | 75.3 | % |  |  | 41.2 | % |  |  | 36.0 | %
Risk-free interest rate |  |  | 0.2 | % |  |  | 2.5 | % |  |  | 2.3 | %
Lack of marketability discount |  |  | 30.5 | % |  |  | 31.3 | % |  |  | 29.2 | %
Expected term (years) |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |
Common Series D Units [Member] |
Schedule Of Assumption Used To Determine Fair Value | The following assumptions were used in determining the fair value for the years ended December 31, 2020, 2019, and 2018:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Grant date fair value |  | $ | 300.00 |  |  | $ | 300.00 |  |  | $ | 300.00 |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected volatility |  |  | 48.0 | % |  |  | 44.0 | % |  |  | 40.0 | %
Risk-free interest rate |  |  | 0.1 | % |  |  | 1.6 | % |  |  | 2.6 | %
Lack of marketability discount |  |  | 23.0 | % |  |  | 26.0 | % |  |  | 25.0 | %
Expected term (years) |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |
Common Series C2 Units [Member] |
Schedule Of Assumption Used To Determine Fair Value | The following weighted average assumptions were used in determining the fair value of Common Series C-2 Unit grants made during the years ended December 31, 2020, 2019 and 2018:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Grant date fair value |  | $ | 223.00 |  |  | $ | 284.00 |  |  | $ | 652.99 |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Yield Test Probability |  |  | 23.3 | % |  |  | 39.0 | % |  |  | 97.1 | %
Cost of Equity Capital |  |  | 11.8 | % |  |  | 11.1 | % |  |  | 12.3 | %
Expected term (years) |  |  | 1.0 |  |  |  | 2.0 |  |  |  | 3.0 |

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