REDEEMABLE PREFERRED STOCK - Issuances, Reclassifications and Redemptions for each class of Preferred Stock in Permanent Equity (Details) - USD ($) $ in Thousands	3 Months Ended		66 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 373,549	$ 278,114
Reclassification of Series A Preferred stock to Perm Equity	7,667	8,243	$ 153,900
Ending balance	$ 377,460	$ 278,515	$ 377,460
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	11,715,354	9,784,067
Beginning balance	$ 310,661	$ 262,036
Ending balance (in shares)	11,995,934	10,125,641	11,995,934
Ending balance	$ 317,737	$ 270,546	$ 317,737
Series A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of Series A Preferred stock to Perm Equity	7,667	8,243
Redemption of Series A Preferred Stock	$ (1,195)	$ (685)
Series A | Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	6,271,337	4,377,762
Beginning balance	$ 156,431	$ 108,729
Reclassification of Series A Preferred Stock to permanent equity (in shares)	329,921	366,991
Reclassification of Series A Preferred stock to Perm Equity	$ 8,304	$ 9,144
Redemption of Series A Preferred Stock (in shares)	(49,341)	(29,462)
Redemption of Series A Preferred Stock	$ (1,228)	$ (733)
Ending balance (in shares)	6,551,917	4,715,291	6,551,917
Ending balance	$ 163,507	$ 117,140	$ 163,507
Series D
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Series D Preferred Stock		$ 96
Series D | Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	56,857	19,145
Beginning balance	$ 1,396	$ 473
Issuance of Series D Preferred Stock (in shares)	0	4,045
Issuance of Series D Preferred Stock	$ 0	$ 99
Ending balance (in shares)	56,857	23,190	56,857
Ending balance	$ 1,396	$ 572	$ 1,396
Series L | Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	5,387,160	5,387,160
Beginning balance	$ 152,834	$ 152,834
Ending balance (in shares)	5,387,160	5,387,160	5,387,160
Ending balance	$ 152,834	$ 152,834	$ 152,834