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	12 Months Ended
	Jun. 30, 2016	Jun. 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	1,466,000	1,466,000	1,499,000
Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	156,000	156,000
June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	1,310,000	1,310,000
Warrant liability	1,310,000	1,310,000
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	1,466,000	1,466,000	$ 1,499,000
Fair Value, Inputs, Level 3 [Member] | Dilutive Financing Derivative Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Derivative liability	156,000	156,000
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Liability [Member]
Schedule Of Derivative Liabilities At Fair Value [Line Items]
Warrant liability	$ 1,310,000	$ 1,310,000