PREFERRED STOCK - Narrative (Details)									12 Months Ended
	Apr. 26, 2021	Dec. 31, 2019 $ / shares shares	Dec. 26, 2019	Apr. 01, 2019	Mar. 05, 2019 USD ($) day member $ / shares shares	Mar. 04, 2019 $ / shares shares	Oct. 10, 2018 USD ($) $ / shares shares	Jan. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares	Mar. 06, 2019 USD ($)
Temporary Equity [Line Items]
Convertible debt | $											$ 0
Temporary equity change of control percentage of stated value					2.50%
Series C Preferred Stock
Temporary Equity [Line Items]
Issuance of preferred stock in extinguishment of debt (in shares)								100,000	0
Redeemable preferred stock, dividend rate, percentage			9.75%		9.75%			9.75%
Shares issued (in dollars per share) | $ / shares								$ 1,000
Mezzanine equity, new issues of stock | $								$ 100,000,000	$ 0
Series C-1 Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage									9.75%	9.75%
Mezzanine equity, shares issued (in shares)		100,000							100,000	100,000
Temporary equity, stated value (in dollars per share) | $ / shares		$ 1,203							$ 1,203	$ 1,093
Series C-2 Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage									9.75%	9.75%
Mezzanine equity, shares issued (in shares)		25,000							25,000	25,000
Temporary equity, stated value (in dollars per share) | $ / shares		$ 1,128							$ 1,128	$ 1,024
Series D Preferred Stock
Temporary Equity [Line Items]
Issuance of preferred stock in extinguishment of debt (in shares)									0
Redeemable preferred stock, dividend rate, percentage									8.25%	8.25%
Mezzanine equity, new issues of stock | $									$ 0
Mezzanine equity, shares issued (in shares)		39,254							39,254	39,254
Temporary equity, stated value (in dollars per share) | $ / shares		$ 1,107							$ 1,107	$ 1,021
Series E Preferred Stock
Temporary Equity [Line Items]
Issuance of preferred stock in extinguishment of debt (in shares)									60,000
Redeemable preferred stock, dividend rate, percentage									8.25%
Mezzanine equity, new issues of stock | $									$ 62,115,000
Mezzanine equity, shares issued (in shares)		60,000							60,000
Temporary equity, stated value (in dollars per share) | $ / shares		$ 1,069							$ 1,069
Series F Preferred Stock
Temporary Equity [Line Items]
Issuance of preferred stock in extinguishment of debt (in shares)									55,000
Redeemable preferred stock, dividend rate, percentage									9.00%
Mezzanine equity, new issues of stock | $									$ 46,682,000
Mezzanine equity, shares issued (in shares)		55,000							55,000
Temporary equity, stated value (in dollars per share) | $ / shares		$ 1,076							$ 1,076
Private Placement
Temporary Equity [Line Items]
Temporary equity, stated value (in dollars per share) | $ / shares					$ 7.00
Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity		130.00%			125.00%
Private Placement | Series C-1 Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage							9.75%
Share price (in dollars per share) | $ / shares								$ 4.42
Private Placement | Series C-2 Preferred Stock
Temporary Equity [Line Items]
Share price (in dollars per share) | $ / shares							$ 4.41
Private Placement | Series D Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					117.50%
Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Temporary equity, stated value (in dollars per share) | $ / shares					$ 1,000	$ 1.88
Conversion price per share (in dollars per share) | $ / shares					$ 2.50
Temporary equity, right to designate, number of board members (in members) | member					1
Percentage of outstanding stock, minimum					5.00%
Private Placement | Series F Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					115.00%
Temporary equity, right to designate, number of board members (in members) | member					1
Amount of outstanding shares required to vote | $					$ 13,800,000
Maximum | Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage				9.75%
Maximum | Private Placement | Series D Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage				8.25%
Maximum | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage				8.25%
Maximum | Private Placement | Series F Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage				9.00%
Maximum | Forecast | Private Placement
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage	15.00%
Maximum | Forecast | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage	9.25%
Maximum | Forecast | Private Placement | Series F Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage	10.00%
Minimum | Forecast | Private Placement
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage	12.00%
Preferred Stock, Redemption, Period One | Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					120.00%
Preferred Stock, Redemption, Period One | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					110.00%
Preferred Stock, Redemption, Period Two | Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					125.00%
Preferred Stock, Redemption, Period Two | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					105.00%
Preferred Stock, Redemption, Period Three | Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					130.00%
Preferred Stock, Redemption, Period Three | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Percentage of redeemable temporary equity					100.00%
Term Loan | Second Lien Term Loan | Maximum | Private Placement
Temporary Equity [Line Items]
Threshold trading days | day					30
Term Loan | Second Lien Term Loan | Minimum | Private Placement
Temporary Equity [Line Items]
Threshold trading days | day					20
Percentage of conversion price					150.00%
Varde Partners, Inc. | Private Placement
Temporary Equity [Line Items]
Mezzanine equity, new issues of stock | $					$ 18,600,000
Mezzanine equity, shares issued (in shares)					9,891,638		5,952,763
Varde Partners, Inc. | Private Placement | Series C Preferred Stock
Temporary Equity [Line Items]
Mezzanine equity, shares issued (in shares)							25,000
Varde Partners, Inc. | Private Placement | Series C-2 Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage							9.75%
Stock, stated value (in dollars per share) | $ / shares							$ 1,000
Temporary equity, value, issued | $							$ 25,000,000
Varde Partners, Inc. | Private Placement | Series D Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage							8.25%
Mezzanine equity, shares issued (in shares)							39,254
Varde Partners, Inc. | Private Placement | Series E Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage					8.25%
Mezzanine equity, new issues of stock | $					$ 60,000,000
Mezzanine equity, shares issued (in shares)					60,000
Varde Partners, Inc. | Private Placement | Series F Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock, dividend rate, percentage					9.00%
Mezzanine equity, new issues of stock | $					$ 55,000,000
Mezzanine equity, shares issued (in shares)					55,000
Varde Partners, Inc. | Private Placement | Series C and D Preferred Stock
Temporary Equity [Line Items]
Mezzanine equity, shares issued (in shares)					7,750,000
Conversion of stock, decrease (in shares)					24,000,000	53,500,000