Equity-Based Compensation - Stock Options (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Number of Units
Outstanding, beginning (in shares)	2,401,382
Granted (in shares)	1,194,385
Exercised (in shares)	(40,252)
Cancelled (in shares)	(44,550)
Outstanding, end (in shares)	3,510,965	2,401,382
Options exercisable, end (in shares)	887,221
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 12.63
Granted (in dollars per share)	13.66
Exercised (in dollars per share)	10.05
Cancelled (in dollars per share)	14.00
Outstanding, end (in dollars per share)	12.99	$ 12.63
Options exercisable, end (in dollars per share)	$ 11.47
Stock options
Weighted average remaining contractual term	8 years 9 months 4 days	8 years 4 months 10 days
Weighted average remaining contractual term, exercisable	7 years 6 months 26 days
Aggregate intrinsic value, beginning	$ 6,523
Aggregate intrinsic value, end	5,298	$ 6,523
Aggregate intrinsic value, exercisable	$ 2,620
Weighted average grant date fair value (in dollars per share)	$ 9.64