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Equity-Based Compensation - Assumptions (Details) - Stock options
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Assumptions used in determining the fair value of options  
Risk-free interest rate 2.46%
Expected dividend yield 0.00%
Expected term (years to liquidity) 6 years 2 months 9 days
Expected volatility 80.40%
Unrecognized equity-based compensation expense $ 17.1
Period for recognition 2 years 10 months 24 days