DEBT - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Cash interest	$ 17,638	$ 6,204	$ 3,229
Accretion	9,710	5,398	2,832
Non-cash interest related to beneficial conversion feature	27,361	0	0
Loss on extinguishment of debt	6,637	0	0
Interest on financing liability	2,643	1,391	416
Total	63,989	$ 12,993	$ 6,477
Loss on extinguishment of debt, prepayment fees and additional cash interest payments	1,656
Loss on extinguishment of debt, write-off of unamortized deferred financing costs	$ 4,981