Common Stock (Public Offering Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2019	Aug. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Components Of Common Stock [Line Items]
Gross proceeds					$ 12,000,000	$ 8,000,000
Warrants, Exercise price			$ 0.51		$ 0.51		$ 0.51
Gain (loss) on derivative instruments, net, pretax			$ (2,054,561)	$ 7,744,708	$ (1,232,925)	$ 41,110,851
Public Offering
Components Of Common Stock [Line Items]
Issuance of common stock in connection with the public offering (in shares)	30.0
Stock price (in dollars per share)	$ 0.40
Gross proceeds	$ 12,000,000
Percentage of commission	7.00%
Underwriter commission	$ 840,000
Compensation for other costs relating To offering	230,000
Costs associated with the offering	$ 173,000
2018 public offerings | Public Offering
Components Of Common Stock [Line Items]
Issuance of common stock (Shares)		20.0
Negotiated price per unit		$ 0.40
Warrants to purchase common stock, shares		20.0
Proceeds from issuance of common stock		$ 8,000,000
Percentage of commission		7.00%
Underwriter commission		$ 560,000
Costs associated with the offering		$ 284,000
Warrants, Exercise price		$ 0.40
Warrant, Term		5 years
Warrants		$ 8,000,000
Net proceeds from issuance of common stock		7,200,000
Non Cash Charges		$ 8,000,000
Percentage of non cash charges exceeding, net cash proceeds (in percent)		100.00%
Gain (loss) on derivative instruments, net, pretax		$ 853,000
Placement Agent Warrants [Member]
Components Of Common Stock [Line Items]
Warrants to purchase common stock, shares	2.1
Warrants, Exercise price	$ 0.50
Warrant, Term	5 years
Placement Agent Warrants [Member] | Public Offering
Components Of Common Stock [Line Items]
Warrants to purchase common stock, shares	2.1
Warrants, Exercise price	$ 0.50