Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2017	10,872,428
Balance at Dec. 31, 2017	$ 11,000	$ 221,371,000	$ (187,640,000)	$ (43,000)	$ 33,699,000	$ (487,000)	$ 33,212,000
Stock-based compensation expense		137,000			137,000		137,000
Foreign currency translation				7,000	7,000		7,000
Net loss			(2,960,000)		(2,960,000)	(410,000)	(3,370,000)
Issuance of common stock and warrants in financing, net of offering costs (in shares)	609,636
Issuance of common stock and warrants in financing, net of offering costs		1,213,000			1,213,000		1,213,000
Cumulative-effect adjustment from adoption of ASC 606 | Accounting Standards Update 2014-09 [Member]			(79,000)		(79,000)		(79,000)
Balance (in shares) at Mar. 31, 2018	11,482,064
Balance at Mar. 31, 2018	$ 11,000	222,721,000	(190,679,000)	(36,000)	32,017,000	(897,000)	31,120,000
Balance (in shares) at Dec. 31, 2018	21,649,147
Balance at Dec. 31, 2018	$ 22,000	235,868,000	(227,435,000)	(13,000)	8,442,000	(1,711,000)	6,731,000
Stock-based compensation expense, net of stock surrenders (in shares)
Stock-based compensation expense		81,000			81,000		81,000
Exercise of pre-funded warrants (in shares)	500,000
Exercise of pre-funded warrants		5,000			5,000		5,000
Discount due to beneficial conversion features		1,513,000			1,513,000		1,513,000
Reorganization of subsidiary and related change in non-controlling interest		(2,843,000)			(2,843,000)	2,843,000
Foreign currency translation				(4,000)	(4,000)		(4,000)
Net loss			(1,871,000)		(1,871,000)	(176,000)	(2,047,000)
Balance (in shares) at Mar. 31, 2019	22,149,147
Balance at Mar. 31, 2019	$ 22,000	$ 234,624,000	$ (229,306,000)	$ (17,000)	$ 5,323,000	$ 956,000	$ 6,279,000