Stockholders' Equity (Share Activity) (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Activity of Shares [Roll Forward]
Common stock, shares outstanding (in shares)	145,971,184
Common stock, shares outstanding (in shares)	145,981,180
Class A-1 Convertible Preferred Stock
Activity of Shares [Roll Forward]
Preferred stock, shares outstanding (in shares)	257,000	257,000
Conversions/Exercises (in shares)	0	0
Preferred stock, shares outstanding (in shares)	257,000	257,000
Class A-2 Convertible Preferred Stock
Activity of Shares [Roll Forward]
Preferred stock, shares outstanding (in shares)	1,331,000	1,416,000
Conversions/Exercises (in shares)	0	(78,000)
Preferred stock, shares outstanding (in shares)	1,331,000	1,338,000
Class A-3 Convertible Preferred Stock
Activity of Shares [Roll Forward]
Preferred stock, shares outstanding (in shares)	259,000	259,000
Conversions/Exercises (in shares)	0	0
Preferred stock, shares outstanding (in shares)	259,000	259,000
Class A-4 Convertible Preferred Stock
Activity of Shares [Roll Forward]
Preferred stock, shares outstanding (in shares)	3,725,720	0
Conversions/Exercises (in shares)	0	0
Preferred stock, shares outstanding (in shares)	3,725,720	0
Warrants
Activity of Shares [Roll Forward]
Warrants outstanding (in shares)	61,868,000	66,038,000
Conversions/Exercises (in shares)	0	(3,920,000)
Warrants outstanding (in shares)	61,868,000	62,118,000
Common Stock
Activity of Shares [Roll Forward]
Common stock, shares outstanding (in shares)
Conversions/Exercises (in shares)		3,199,000
Common stock, shares outstanding (in shares)