Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital Attributable to Convertible Option [Member]	Additional Paid-in Capital Excluding Amounts Attributable to Convertible Instruments [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2017	0	908,768,116
Balance at Dec. 31, 2017		$ 909	$ 18,179	$ 284,894	$ (250,154)		$ (73)	$ 53,755
Stock option exercises (in shares)	0	5,438,716						5,438,716
Stock option exercises		$ 5		458				$ 463
Stock-based compensation				924				924
Net loss					(8,700)		(1)	(8,701)
Other comprehensive income
Balance (in shares) at Dec. 31, 2018	0	914,206,832
Balance at Dec. 31, 2018		$ 914	18,179	286,276	(258,854)		(74)	$ 46,441
Stock option exercises (in shares)		243,125						243,125
Stock option exercises				21				$ 21
Stock-based compensation				535				535
Net loss					(7,430)		(1)	(7,431)
Other comprehensive income						2		2
Balance (in shares) at Dec. 31, 2019	0	914,449,957
Balance at Dec. 31, 2019		$ 914	$ 18,179	$ 286,832	$ (266,284)	$ 2	$ (75)	$ 39,568