Fair Value of Financial Assets and Liabilities - Derivative Instruments (Fair Value of Financial Liabilities Measured on Recurring Basis) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	$ 2,329,000	$ 2,443,000
Total liabilities	2,329,000	2,443,000
Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	123,000	126,000
November 2016 Warrant Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	1,961,000	2,043,000
June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	245,000	274,000
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 Warrant Derivative Liability [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 Warrant Derivative Liability [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	2,329,000	2,443,000
Fair Value, Inputs, Level 3 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	123,000	126,000
Fair Value, Inputs, Level 3 [Member] | November 2016 Warrant Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	1,961,000	2,043,000
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	$ 245,000	$ 274,000