Fair Value Measurements (Fair Value of Financial Liabilities Measured on Recurring Basis) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	$ 33,000	$ 22,000
June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	1,000	1,000
November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	32,000	21,000
Fair Value, Inputs, Level 1 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 1 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 1 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 2 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 2 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities
Fair Value, Inputs, Level 3 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	33,000	22,000
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	1,000	1,000
Fair Value, Inputs, Level 3 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liabilities	$ 32,000	$ 21,000