CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member] Convertible Preferred Stock - Series C [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total	Convertible Preferred Stock - Series C [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative accounting adjustment from adoption of new standard net of tax | ASU 2014-09 [Member]	$ 0	$ 0	$ 0	$ (234)	$ (234)
Cumulative accounting adjustment from adoption of new standard net of tax | ASU 2017-11 [Member]			2,614	(2,547)	67
Beginning balance at Dec. 31, 2017	$ 4	$ 4	223,829	(203,957)	19,880
Beginning balance (in shares) at Dec. 31, 2017	36,182	4,304,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	19	0	19
Conversion of convertible preferred stock into common stock	$ 0	$ 0	0	0	0
Conversion of convertible preferred stock into common stock (in shares)	(202)	75,000
Net loss	$ 0	$ (512)	0	(2,081)	(2,081)	$ (1,569)
Ending balance at Mar. 31, 2018	$ 4	$ 4	226,462	(208,819)	17,651
Ending balance (in shares) at Mar. 31, 2018	35,980	4,379,425
Beginning balance at Dec. 31, 2018	$ 1	$ 30	241,988	(210,771)	31,248
Beginning balance (in shares) at Dec. 31, 2018	9,968	29,943,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 0	$ 0	323	0	323
Conversion of convertible preferred stock into common stock	$ 0	$ 1	(1)	0	0
Conversion of convertible preferred stock into common stock (in shares)	(3,090)	1,148,698
Exercise of options	$ 0	$ 0	0	0	0
Exercise of options (in shares)	0	28,824
Net loss	$ 0	$ (1,216)	0	(1,333)	(1,333)	$ (117)
Ending balance at Mar. 31, 2019	$ 1	$ 31	$ 242,310	$ (212,104)	$ 30,238
Ending balance (in shares) at Mar. 31, 2019	6,878	31,120,608