Stockholders' Equity (Details Narrative) - USD ($)					1 Months Ended			2 Months Ended	12 Months Ended
	Oct. 30, 2019	Nov. 09, 2018	Jul. 31, 2018	Aug. 31, 2015	Apr. 30, 2019	Oct. 31, 2018	Jul. 31, 2018	May 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2019	Apr. 30, 2018	Mar. 31, 2014
Class of Stock [Line Items]
Preferred shares authorized									100,000	100,000
Stated value per share									$ 0.01	$ 0.01
Sale of preferred stock									$ 0	$ 13,891,000
Accrued dividends									$ 1,505,000	$ 1,064,000
Common stock, outstanding (in shares)									10,869,530	10,761,684
Repurchase of common stock									$ (89,000)	$ 46,000
Warrants
Class of Stock [Line Items]
Warrants outstanding, weighted average exercise price (per share)									$ 0.63
Warrants canceled (in shares)									150,000
Number of warrants expired ( in shares)									600,000
Warrants
Class of Stock [Line Items]
Common stock exercise price (per share)									$ 0.55
Class of warrants outstanding (in shares)									35,517,329
Adjustable warrants (shares)									34,587,030
Subscription Agreements | Warrants
Class of Stock [Line Items]
Stated value per share		$ 0.75
Warrants to purchase of common stock (shares)		73,000	0.75				0.75
Common stock exercise price (per share)			$ 0.55				$ 0.55
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock designated (in shares)									1,000
Preferred stock outstanding (shares)									0
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock designated (in shares)									90,000
Preferred stock outstanding (shares)									0
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock designated (in shares)													1,200
Stated value per share									$ 5,000
Preferred stock liquidation preference per share									$ 5,100
Preferred stock, voting rights									voting rights of 666.67 votes per share
Common stock at a conversion price, per share									$ 7.50
Conversion of preferred stock to common stock (in shares)									100	100
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock designated (in shares)				220
Conversion of preferred stock to common stock (in shares)									40	40
Series D Preferred Stock | Securities Purchase Agreement
Class of Stock [Line Items]
Stated value per share				$ 5,000
Preferred stock liquidation preference per share				$ 300
Preferred stock, voting rights				voting rights of 1,250 votes per share
Common stock at a conversion price, per share				$ 4.00
Preferred stock, dividend rate, percentage				5.00%
Series E Convertible Preferred Stock
Class of Stock [Line Items]
Preferred shares authorized									3,500	3,500
Preferred stock designated (in shares)												3,500
Preferred stock outstanding (shares)									3,478	3,488
Stated value per share									$ 0.01	$ 0.01
Accrued dividends, preferred stock									$ 2,400,000	$ 1,000,000.0
unregistered common stock (in shares)					107,846
Preferred stock conversion stated value					53,923
Series E Convertible Preferred Stock | Subscription Agreements
Class of Stock [Line Items]
Sale of stock (shares)								2,812
Preferred stock, dividend rate, percentage								8.00%
Series E Convertible Preferred Stock | Subscription Agreements | Warrants
Class of Stock [Line Items]
Stated value per share					$ 5,000
Common stock at a conversion price, per share					$ 0.50
Warrants to purchase of common stock (shares)					0.75
Warrant term					5 years
Warrants
Class of Stock [Line Items]
Common stock exercise price (per share)					$ 0.55
Warrant term					5 years
Series F Convertible Preferred Stock
Class of Stock [Line Items]
Preferred shares authorized									2,200	2,200
Preferred stock designated (in shares)											2,200
Preferred stock outstanding (shares)									361	381
Stated value per share									$ 0.01	$ 0.01
Common stock exercise price (per share)			0.50				0.50
Repurchase of common stock	$ 100,000
Repurchase of common stock, (shares)	20
Accrued and unpaid fees	$ 150,000
Series F Convertible Preferred Stock | Subscription Agreements
Class of Stock [Line Items]
Stated value per share			$ 5,000				$ 5,000
Sale of stock (shares)		73					308
Warrants to purchase of common stock (shares)			308,000				308,000
Common stock exercise price (per share)		$ 0.55	$ 0.50				$ 0.50
Preferred stock, dividend rate, percentage							8.00%
Warrant term		5 years	5 years				5 years		5 years
Placement agent fees and estimated expenses		$ 310,000	$ 180,000
Proceeds from issuance of private placement			$ 1,400,000
Purchase price of preferred stock		$ 5,000
Warrants outstanding, weighted average exercise price (per share)		$ 0.55
Series F Convertible Preferred Stock | Subscription Agreements | Warrants
Class of Stock [Line Items]
Common stock at a conversion price, per share			$ 0.50				$ 0.50
Series F Preferred Stock
Class of Stock [Line Items]
Accrued dividends									$ 202,000	$ 90,000
Common Stock
Class of Stock [Line Items]
Common stock, outstanding (in shares)									10,869,530
Private Placement | Subscription Agreements
Class of Stock [Line Items]
Warrants to purchase of common stock (shares)					2,958,460
Sale of preferred stock								$ 12,200,000
Placement agent fees and estimated expenses								$ 2,000,000.0
Private Placement | Series E Preferred Stock | Subscription Agreements
Class of Stock [Line Items]
Conversion of stock (in shares)						2
Conversion of preferred stock to common stock (in shares)						20,000