Equity-Based Awards - Stock Option Award Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Quantity
Outstanding beginning balance (in shares)	4,197,243
Granted (in shares)	1,288,430
Exercised (in shares)	(492,061)
Cancelled (in shares)	(515,246)
Outstanding ending balance (in shares)	4,478,366	4,197,243
Vested and exercisable ending balance (in shares)	2,201,768
Exercise Price
Outstanding beginning balance (in dollars per share)	$ 20.80
Granted (in dollars per share)	21.37
Exercised (in dollars per share)	15.14
Cancelled (in dollars per share)	21.87
Outstanding ending balance (in dollars per share)	21.46	$ 20.80
Vested and exercisable at ending balance (in dollars per share)	$ 21.05
Remaining Contractual Term (years)
Outstanding balance	7 years 4 months 24 days	7 years 7 months 6 days
Vested and exercisable ending balance	6 years 1 month 6 days
Aggregate Intrinsic Value (in thousands)
Outstanding balance	$ 8,000	$ 9,257
Vested and exercisable ending balance	$ 5,832
Closing price of common stock (in dollars per share)	$ 22.44