BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statements of Cash Flows
Depreciation and amortization, net	$ 10,095	$ 10,244
Deferred rent and amortization of intangible assets, liabilities and lease inducements		0
Other assets	(2,191)	(552)
Payment of revolving credit facilities, mortgages payable, term notes and principal on SBA 7(a) loan-backed notes	(94,351)	(10,370)
Payment of principal on SBA 7(a) loan-backed notes		0
Payment of unsecured revolving lines of credit, revolving credit facility and or term note		0
Proceeds from revolving credit facilities and term notes	30,396	76,966
Proceeds from unsecured revolving lines of credit, revolving credit facility and or term note		0
Borrowed funds from the Federal Reserve through the Paycheck Protection Program Liquidity Facility		0
Payment of deferred costs	(125)	(203)
Payment of deferred loan costs		0
Net proceeds from issuance of Preferred Stock	15,484	21,466
Additions to deferred loan costs included in accounts payable and accrued expenses		0
Accrued deferred costs	1	457
Preferred stock offering costs offset against redeemable preferred stock	250	305
Preferred stock offering costs offset against redeemable preferred stock in permanent equity		0
Accrued redeemable preferred stock fees	$ 640	249
Series D Preferred Stock
Consolidated Statements of Cash Flows
Net proceeds from issuance of Preferred Stock		0
Accrued redeemable preferred stock fees		0
As previously reported
Consolidated Statements of Cash Flows
Depreciation and amortization, net		10,455
Deferred rent and amortization of intangible assets, liabilities and lease inducements		(1,341)
Other assets		578
Payment of revolving credit facilities, mortgages payable, term notes and principal on SBA 7(a) loan-backed notes		0
Payment of principal on SBA 7(a) loan-backed notes		(5,370)
Payment of unsecured revolving lines of credit, revolving credit facility and or term note		(5,000)
Proceeds from revolving credit facilities and term notes		0
Proceeds from unsecured revolving lines of credit, revolving credit facility and or term note		61,500
Borrowed funds from the Federal Reserve through the Paycheck Protection Program Liquidity Facility		15,466
Payment of deferred costs		(70)
Payment of deferred loan costs		(133)
Net proceeds from issuance of Preferred Stock		21,296
Additions to deferred loan costs included in accounts payable and accrued expenses		292
Accrued deferred costs		165
Preferred stock offering costs offset against redeemable preferred stock		303
Preferred stock offering costs offset against redeemable preferred stock in permanent equity		2
Accrued redeemable preferred stock fees		247
As previously reported | Series D Preferred Stock
Consolidated Statements of Cash Flows
Net proceeds from issuance of Preferred Stock		170
Accrued redeemable preferred stock fees		2
Reclassification
Consolidated Statements of Cash Flows
Depreciation and amortization, net		(211)
Deferred rent and amortization of intangible assets, liabilities and lease inducements		1,341
Other assets		(1,130)
Payment of revolving credit facilities, mortgages payable, term notes and principal on SBA 7(a) loan-backed notes		(10,370)
Payment of principal on SBA 7(a) loan-backed notes		5,370
Payment of unsecured revolving lines of credit, revolving credit facility and or term note		5,000
Proceeds from revolving credit facilities and term notes		76,966
Proceeds from unsecured revolving lines of credit, revolving credit facility and or term note		(61,500)
Borrowed funds from the Federal Reserve through the Paycheck Protection Program Liquidity Facility		(15,466)
Payment of deferred costs		(133)
Payment of deferred loan costs		133
Net proceeds from issuance of Preferred Stock		170
Additions to deferred loan costs included in accounts payable and accrued expenses		(292)
Accrued deferred costs		292
Preferred stock offering costs offset against redeemable preferred stock		2
Preferred stock offering costs offset against redeemable preferred stock in permanent equity		(2)
Accrued redeemable preferred stock fees		2
Reclassification | Series D Preferred Stock
Consolidated Statements of Cash Flows
Net proceeds from issuance of Preferred Stock		(170)
Accrued redeemable preferred stock fees		$ (2)