Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Liabilities
Bookings Commitment	$ 1,661	$ 1,662
Recurring basis
Liabilities
Bookings Commitment	34,474	32,651
Interest make-whole derivative		4
Recurring basis | Quoted price in active markets for identical assets (Level 1)
Liabilities
Bookings Commitment	0	0
Interest make-whole derivative		0
Recurring basis | Significant other observable inputs (Level 2)
Liabilities
Bookings Commitment	0	0
Interest make-whole derivative		0
Recurring basis | Significant unobservable inputs (Level 3)
Liabilities
Bookings Commitment	$ 34,474	32,651
Interest make-whole derivative		$ 4