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Stockholders' Deficit - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Unrecognized stock based compensation | $ 70.0 |
Unrecognized stock based compensation, period for recognition | 2 years |
Related to SGC RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Granted (in dollars per share) | $ 52.62 | $ 10.44
Awards vested in period, fair value | $ 62.1 | $ 7.8

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