CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Preferred Stock [Member] Series C Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Effect of Adoption Higher / (Lower) [Member]	Total	Series C Convertible Preferred Stock [Member]
Beginning balance at Dec. 31, 2017	$ 4	$ 4	$ 251,643	$ (229,406)		$ 22,245
Beginning balance (ASU 2014-09 [Member]) at Dec. 31, 2017	$ 4	$ 4	251,643	(229,640)		22,011
Beginning balance (in shares) at Dec. 31, 2017	36,182	4,304,425
Beginning balance (in shares) (ASU 2014-09 [Member]) at Dec. 31, 2017	36,182	4,304,425
Adoption of accounting standard (ASU 2014-09 [Member]) at Dec. 31, 2017	$ 0	$ 0	0		$ (234)	(234)
Stock-based compensation	0	0	570	0		570
Conversion of convertible preferred stock into common stock	$ (3)	$ 10	(7)	0		0
Conversion of convertible preferred stock into common stock (in shares)	(26,214)	9,744,916
Sale of common stock, net of expenses	$ 0	$ 16	14,648	0		14,664
Sale of common stock, net of expenses (in shares)	0	15,893,745
Net loss	$ 0	$ 0	0	(3,868)		(3,868)	$ (1,375)
Ending balance at Sep. 30, 2018	$ 1	$ 30	$ 266,854	$ (233,508)		$ 33,377
Ending balance (in shares) at Sep. 30, 2018	9,968	29,943,086