Stockholders' Equity (Details Narrative) - USD ($)			1 Months Ended			2 Months Ended	3 Months Ended
	Oct. 30, 2019	Nov. 09, 2018	Apr. 30, 2019	Oct. 31, 2018	Jul. 31, 2018	May 31, 2018	Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Conversion of Series E Preferred stock for common stock (in shares)				2
Shares issued upon conversion				20,000
Warrants outstanding (in shares)							36,272,500
Warrants
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Weighted average exercise price (in dollars per share)							$ 0.56
Warrant
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants outstanding (in shares)							36,272,500
Adjustable warrants, shares							35,580,017
Number of warrants expired							1,189,079
Warrant | Convertible Debt
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants outstanding (in shares)							1,944,250
Series E convertible preferred stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of unregistered shares issued during period			107,846
Conversion of Series C Preferred stock for common stock			$ 53,923
Accrued dividends							$ 2,700,000
Series F Convertible preferred stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Accrued dividends							$ 238,000
Stock repurchased during period (in shares)	20
Accrued and unpaid fees	$ 150,000
Value of stock repurchased during period	$ 100,000
Subscription Agreements | Warrant
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants to purchase shares of common stock (in shares)		0.75
Exercise price per share (in dollars per share)		$ 0.55				$ 0.55
Term of warrant		5 years			5 years	5 years
Subscription Agreements | Warrant | Private Placement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants to purchase shares of common stock (in shares)		73,000			308,000	2,958,460
Subscription Agreements | Series E convertible preferred stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Sale of stock (in shares)						2,812
Exercise price per share (in dollars per share)					$ 0.50
Preferred stock stated dividend rate						8.00%
Subscription Agreements | Series E convertible preferred stock | Private Placement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Proceeds from private placement						$ 12,200,000
Placement agent fees and estimated expenses						2,000,000.0
Subscription Agreements | Series E convertible preferred stock | Warrant
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purchase price of preferred stock						$ 5,000
Common stock at a conversion price (in dollars per share)						$ 0.50
Term of warrant			5 years
Warrants to purchase shares of common stock (in shares)						0.75
Subscription Agreements | Series F Convertible preferred stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Sale of stock (in shares)		73			308
Purchase price of preferred stock		$ 5,000			$ 5,000
Common stock at a conversion price (in dollars per share)		$ 0.50			$ 0.50
Term of warrant		5 years			5 years
Preferred stock stated dividend rate					8.00%
Term of warrant					5 years
Proceeds from private placement		$ 300,000			$ 1,400,000
Placement agent fees and estimated expenses					$ 180,000
Weighted average exercise price (in dollars per share)		$ 0.55			$ 0.55
Subscription Agreements | Series F Convertible preferred stock | Warrant
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants to purchase shares of common stock (in shares)					0.75
Exercise price per share (in dollars per share)					$ 0.55