CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Preferred Stock [Member] Series C Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock Issuable [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	$ 0	$ 251,643	$ (229,406)		$ 22,245
Beginning balance (ASU 2014-09 [Member]) at Dec. 31, 2017	$ 4	$ 4	$ 0	251,643	(229,640)		22,011
Beginning balance (in shares) at Dec. 31, 2017	36,182	4,304,425	0
Beginning balance (in shares) (ASU 2014-09 [Member]) at Dec. 31, 2017	36,182	4,304,425	0
Adoption of accounting standard (ASU 2014-09 [Member]) at Dec. 31, 2017	$ 0	$ 0	$ 0	0		$ (234)	(234)
Stock-based compensation	0	0	0	203	0		203
Conversion of convertible preferred stock into common stock	$ (3)	$ 10	$ 0	(7)	0		0
Conversion of convertible preferred stock into common stock (in shares)	(26,067)	9,690,332	0
Sale of common stock, net of expenses	$ 0	$ 16	$ 0	14,648	0		14,664
Sale of common stock, net of expenses (in shares)	0	15,740,741	0
Common stock issuable	$ 0	$ 0	$ 0	0	0		0
Common stock issuable (in shares)	0	0	153,004
Net loss	$ 0	$ 0	$ 0	0	(3,578)		(3,578)	$ (1,998)
Ending balance at Jun. 30, 2018	$ 1	$ 30	$ 0	$ 266,487	$ (233,218)		$ 33,300
Ending balance (in shares) at Jun. 30, 2018	10,115	29,735,498	153,004