Fair Value Measurements (Fair Value of Financial Liabilities Measured on Recurring Basis) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	$ 187,000	$ 292,000
Total liabilities	187,000	292,000
Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	155,000
November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	155,000	260,000
June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	32,000	32,000
Fair Value, Inputs, Level 1 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Total liabilities
Fair Value, Inputs, Level 1 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 1 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 1 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 2 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Total liabilities
Fair Value, Inputs, Level 2 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 2 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 2 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability
Fair Value, Inputs, Level 3 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Total liabilities	187,000	292,000
Fair Value, Inputs, Level 3 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	155,000
Fair Value, Inputs, Level 3 [Member] | November 2016 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability		260,000
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	$ 32,000	$ 32,000