Equity-Based Compensation Expense (RSU) (Details) $ / shares in Units, $ in Thousands							3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 24, 2020 $ / shares	Mar. 13, 2020 $ / shares shares	Mar. 11, 2020 $ / shares	Feb. 20, 2020 $ / shares shares	Jul. 31, 2019 shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 22, 2020 $ / shares shares	Sep. 30, 2019 USD ($) shares	Jun. 30, 2021	Dec. 23, 2020	Jun. 30, 2020	Jun. 27, 2019 employee
Weighted Average Grant Date Fair Value
Equity-based compensation expense | $							$ 10,445	$ 28,174	$ 65,369		$ 67,844
RSUs vested with delivery deferred (shares)									140,000
RSUs delivered in current period that vested in prior period (shares)											43,000
RSUs granted to executives resulting from CGC transaction (shares)							4,909,000
Number of employees awarded under plan | employee															5
Vesting schedule for RSUs granted to executives resulting from CGC transaction														25.00%
RSUs granted to executives resulting from CGC transaction, expense | $							$ 1,783		$ 10,132
RSUs granted to employees resulting from CGC transaction (shares)						1,778,000
RSUs granted to employees resulting from CGC transaction, expense | $							905		$ 4,548
Forecast
Weighted Average Grant Date Fair Value
Vesting schedule for RSUs granted to executives resulting from CGC transaction												25.00%	50.00%
Restricted Stock Units (RSUs)
RSUs
Beginning Balance (shares)									7,843,000	7,843,000
Granted (shares)			630		1,505,000					4,970,000
Forfeited (shares)										(2,654,000)
Vested (shares)					(148,000)					(2,998,000)
Ending Balance (shares)										7,161,000
Vested and unreleased (shares)										136,000
Exchange pursuant to Amended Arrangement (shares)										(7,297,000)
Outstanding (shares)										0
Weighted Average Grant Date Fair Value
Beginning Balance (USD per share) | $ / shares									$ 15.10	$ 15.10
Granted (USD per share) | $ / shares		$ 6.41	$ 2.15	$ 4.50	$ 5.11					3.60
Forfeited (USD per share) | $ / shares										11.29
Vested (USD per share) | $ / shares										11.60
Ending Balance (USD per share) | $ / shares										9.99
Vested and unreleased (USD per share) | $ / shares										16.33
Outstanding (USD per share) | $ / shares										$ 0
Requisite service period									2 years
Equity-based compensation expense | $							5,424		$ 31,522
Fair value | $							$ 874		8,125
Weighted average remaining contractual term							2 years
Aggregate intrinsic value, outstanding | $	$ 16,268						$ 16,268		16,268
Unrecognized compensation expense | $	$ 54,634						$ 54,634		$ 54,634
Unrecognized compensation expense, period							2 years
Restricted Stock Units, Fixed
RSUs
Beginning Balance (shares)	5,012,000
Granted (shares)	0
Forfeited (shares)	0
Vested (shares)	(2,000)
Ending Balance (shares)	5,010,000						5,010,000		5,010,000
Vested and unreleased (shares)	98,000						98,000		98,000
Outstanding (shares)	5,108,000						5,108,000		5,108,000
Weighted Average Grant Date Fair Value
Beginning Balance (USD per share) | $ / shares	$ 9.99
Granted (USD per share) | $ / shares	0
Forfeited (USD per share) | $ / shares	0
Vested (USD per share) | $ / shares	16.45
Vested and unreleased (USD per share) | $ / shares	16.33						$ 16.33		$ 16.33
Outstanding (USD per share) | $ / shares	$ 10.11						$ 10.11		$ 10.11
Restricted Stock Units, Floating
RSUs
Beginning Balance (shares)	2,148,000
Granted (shares)	0
Forfeited (shares)	0
Vested (shares)	(1,000)
Ending Balance (shares)	2,147,000						2,147,000		2,147,000
Vested and unreleased (shares)	42,000						42,000		42,000
Outstanding (shares)	2,189,000						2,189,000		2,189,000
Weighted Average Grant Date Fair Value
Beginning Balance (USD per share) | $ / shares	$ 9.99
Granted (USD per share) | $ / shares	0
Forfeited (USD per share) | $ / shares	0
Vested (USD per share) | $ / shares	16.45
Vested and unreleased (USD per share) | $ / shares	16.33						$ 16.33		$ 16.33
Outstanding (USD per share) | $ / shares	$ 10.11						$ 10.11		$ 10.11