Equity-Based Compensation - Stock options (Details) - Stock options $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Number of Shares
Granted (in shares) | shares	1,484,105
Forfeited (in shares) | shares	(784)
Outstanding, end (in shares) | shares	1,483,321
Outstanding exercisable, end (in shares) | shares	53,217
Weighted Average Exercise Price
Granted (in dollars per share)	$ 9.51
Forfeited (in dollars per share)	10.21
Outstanding, end (in dollars per share)	9.51
Outstanding exercisable, end (in dollars per share)	$ 6.77
Stock options
Weighted average remaining contractual term	9 years 9 months 7 days
Aggregate intrinsic value | $	$ 9,984
Weighted average remaining contractual term, exercisable	9 years 8 months 1 day
Aggregate intrinsic value, exercisable | $	$ 490
Weighted average fair value of options granted	$ 6.72