Subsequent Events (Details) - USD ($)				1 Months Ended	3 Months Ended	4 Months Ended
	Mar. 12, 2021	Dec. 07, 2020	Nov. 25, 2020	May 06, 2021	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock, shares issued (in shares)					110,140,224	110,140,224	64,362,505
Preferred Stock, Series D
Subsequent Event [Line Items]
Preferred stock percentage			8.45%		8.45%
Preferred stock, shares issued (in shares)					1,678,772	1,678,772	1,791,461
Preferred Stock, Series D | Subsequent Event
Subsequent Event [Line Items]
Preferred stock percentage				8.45%
Preferred Stock, Series F
Subsequent Event [Line Items]
Preferred stock percentage			7.375%		7.375%
Preferred stock, shares issued (in shares)					2,037,824	2,037,824	2,891,440
Preferred Stock, Series F | Subsequent Event
Subsequent Event [Line Items]
Preferred stock percentage				7.375%
Preferred Stock, Series G
Subsequent Event [Line Items]
Preferred stock percentage			7.375%		7.375%
Preferred stock, shares issued (in shares)					3,172,279	3,172,279	4,422,623
Preferred Stock, Series G | Subsequent Event
Subsequent Event [Line Items]
Preferred stock percentage				7.375%
Preferred Stock, Series H
Subsequent Event [Line Items]
Preferred stock percentage					7.50%
Preferred stock, shares issued (in shares)					2,002,137	2,002,137	2,668,637
Preferred Stock, Series H | Subsequent Event
Subsequent Event [Line Items]
Preferred stock percentage				7.50%
Preferred Stock, Series I
Subsequent Event [Line Items]
Preferred stock percentage					7.50%
Preferred stock, shares issued (in shares)					1,999,575	1,999,575	3,391,349
Preferred Stock, Series I | Subsequent Event
Subsequent Event [Line Items]
Preferred stock percentage				7.50%
Convertible Common Stock | Subsequent Event
Subsequent Event [Line Items]
Common stock, shares issued (in shares)				17,200,000
Convertible Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares issued (in shares)				1,700,000
Private Placement | Lincoln Park Capital Fund, LLC
Subsequent Event [Line Items]
Shares issued (in shares)	162,655	190,840				10,400,000
Gross proceeds received						$ 25,100,000
Private Placement | Lincoln Park Capital Fund, LLC | Subsequent Event
Subsequent Event [Line Items]
Shares issued (in shares)				20,200,000
Gross proceeds received				$ 42,600,000