Fair Value Measurements (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 29, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Sep. 19, 2017	Apr. 24, 2017	Apr. 23, 2017	Nov. 30, 2016	Jun. 30, 2016
Derivatives And Fair Value [Line Items]
Remaining shares authorized for issuance		67,000,000	67,000,000			67,000,000		67,000,000		67,000,000	670,000,000
Derivative liability		$ 400,000	$ 400,000			$ 400,000		$ 2,443,000
Common stock closing price					$ 0.78			$ 4.40	$ 0.99
Fair value of shares issued						22,000
Change in fair value of derivative liabilities			(37,000)	$ 1,032,000		1,997,000	$ 2,403,000
Common Stock Issuance Agreement [Member]
Derivatives And Fair Value [Line Items]
Shares issued per agreements		523,210
Future shares of common stock approved to be issued per agreement								28,684
Common Stock Issuance Agreement Amendment [Member]
Derivatives And Fair Value [Line Items]
Shares issued per agreements	28,684				28,684
Fair value of shares issued	$ 22,000
Dilutive Financing Derivative Liability [Member]
Derivatives And Fair Value [Line Items]
Derivative liability		$ 368,000	368,000			368,000		$ 126,000
Fair value of shares issued						22,000
Dilutive Financing Derivative Liability [Member] | Common Stock Issuance Agreement Amendment [Member]
Derivatives And Fair Value [Line Items]
Change in fair value of derivative liabilities						(104,000)
November 2016 Warrants [Member]
Derivatives And Fair Value [Line Items]
Derivative liability		$ 368,000	$ 368,000			$ 368,000		$ 2,043,000
Common stock closing price		$ 0.91	$ 0.91			$ 0.91		$ 4.40
Number of securities called by warrants												533,500
June 2016 Offering Liability [Member]
Derivatives And Fair Value [Line Items]
Derivative liability		$ 32,000	$ 32,000			$ 32,000		$ 274,000
Common stock closing price		$ 0.91	$ 0.91			$ 0.91		$ 4.40
Number of securities called by warrants													106,383