Fair Value of Financial Assets and Liabilities - Derivative Instruments (Fair Value of Financial Liabilities Measured on Recurring Basis) (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Transfers between fair value levels, in	$ 0			$ 0	$ 0
Transfers between fair value levels, out	0			0	0
Gain on derivative liability		$ 91,000	$ 91,000
Series B preferred stock derivative liability					1,493,000
Warrant liability					6,000
Total liabilities	1,649,000			1,649,000	1,499,000
Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	382,000			382,000
June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability	1,267,000			1,267,000
Fair Value, Inputs, Level 1 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Series B preferred stock derivative liability
Warrant liability
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] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability
Fair Value, Inputs, Level 2 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Series B preferred stock derivative liability
Warrant liability
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] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability
Fair Value, Inputs, Level 3 [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Series B preferred stock derivative liability					1,493,000
Warrant liability					6,000
Total liabilities	1,649,000			1,649,000	$ 1,499,000
Fair Value, Inputs, Level 3 [Member] | Series 2011 Warrants [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability	0			0
Fair Value, Inputs, Level 3 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	382,000			382,000
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability	$ 1,267,000			$ 1,267,000