Condensed Consolidated Statement of Changes in Stockholders' Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Series E Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2017	$ 13,758	$ 0	$ 2	$ 127,292	$ (113,536)
Balance (in shares) at Dec. 31, 2017		12,191	21,002,212
Conversion of Series E Preferred Stock and dividends	0	$ 0	$ 2	(2)	0
Conversion of Series E Preferred Stock and dividends (in shares)		(8,478)	23,825,614
Common stock issued to consultant	38	$ 0	$ 0	38	0
Common stock issued to consultant (in shares)		0	100,000
Down round trigger in connection with Series E Preferred Stock	10,127	$ 0	$ 0	10,127	0
Accretion of down round trigger in connection with Series E Preferred Stock	(10,127)	0	0	(10,127)	0
Down round trigger in connection with warrants	1,013	0	0	1,013	0
Accretion of down round trigger in connection with warrants	(1,013)	0	0	(1,013)	0
Conversion of May 2018 Convertible Notes	0	$ 0	$ 0	0	0
Conversion of May 2018 Convertible Notes (in shares)		0	1,845
Share-based compensation	131	$ 0	$ 0	131	0
Share-based compensation (in shares)		0	0
Series E Preferred Stock dividends	(342)	$ 0	$ 0	(342)	0
Series E Preferred Stock accreted value from dividends	396	0	0	396	0
Placement agent warrants	91	0	0	91	0
Exercise of warrants	3	$ 0	$ 0	3	0
Exercise of warrants (In shares)		0	34,820
Net loss	(13,233)	$ 0	$ 0	0	(13,233)
Balance at Sep. 30, 2018	$ 842	$ 0	$ 4	$ 127,607	$ (126,769)
Balance (in shares) at Sep. 30, 2018		3,713	44,964,491