REDEEMABLE PREFERRED STOCK - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2020
Class of Stock [Line Items]
Gross proceeds from issuance of preferred stock and warrants	$ 190,300,000
Net proceeds from issuance of Preferred Stock	29,829,000	$ 41,958,000
Issuance offering costs for preferred stock and warrants	15,900,000
Non-issuance offering costs for preferred stock and warrants	$ 8,000,000
Registration Statement
Class of Stock [Line Items]
Number of warrants included in preferred stock unit (in shares)			1
Series A Preferred Warrants
Class of Stock [Line Items]
Warrants issued (in shares)	4,603,287
Gross proceeds from issuance of preferred stock and warrants	$ 761,000
Issuance offering costs for preferred stock and warrants	142,000
Reclassification to deferred rent receivable and charges	$ 5,000
Warrants outstanding (in shares)	4,541,852
Outstanding common stock available for purchase (in shares)	1,178,125
Series A Preferred Stock
Class of Stock [Line Items]
Gross proceeds from issuance of preferred stock and warrants	$ 188,200,000
Issuance offering costs for preferred stock and warrants	15,700,000
Reclassification to deferred rent receivable and charges	$ 1,700,000
Preferred stock, shares outstanding (in shares)	7,903,302
Preferred stock, shares redeemed (in shares)	223,295
Series A Preferred Stock | Preferred Stock, Shares Issued, One
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	7,557,916
Series A Preferred Stock | Preferred Stock, Shares Issued, Two
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	568,681
Net proceeds from issuance of Preferred Stock	$ 0
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	56,857	19,145
Gross proceeds from issuance of preferred stock and warrants	$ 1,400,000
Issuance offering costs for preferred stock and warrants	35,000
Reclassification to deferred rent receivable and charges	$ 13,000
Preferred stock, shares outstanding (in shares)	56,857	19,145
Preferred stock, shares redeemed (in shares)	0
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	1,633,965	2,008,256
Preferred stock, shares outstanding (in shares)	1,631,965	2,007,856
Series A Preferred Stock | Registration Statement
Class of Stock [Line Items]
Number of shares included in preferred stock unit (in shares)			1