Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Balance (in shares) at Dec. 31, 2018		75,501,394
Balance at Dec. 31, 2018		$ 75	$ 414,001	$ (406,924)	$ 7,152
Net loss				(3,716)	(3,716)
Common stock issued in conjunction with exercise of stock options (in shares)		19,687
Common stock issued in conjunction with exercise of stock options			17		17
Common stock issued for restricted stock awards (in shares)		11,667
Common stock issued for restricted stock awards			3		3
Stock compensation charge			181		181
Balance (in shares) at Mar. 31, 2019		75,532,748
Balance at Mar. 31, 2019		$ 75	414,202	(410,640)	3,637
Balance (in shares) at Dec. 31, 2019		97,286,157
Balance at Dec. 31, 2019		$ 97	430,802	(422,161)	8,738
Net loss				(3,706)	(3,706)
Common stock issued in conjunction with exercise of stock options (in shares)		2,500
Common stock issued in conjunction with exercise of stock options			1		1
Stock compensation charge			269		269
Balance (in shares) at Mar. 31, 2020		97,288,657
Balance at Mar. 31, 2020		$ 97	$ 431,072	$ (425,867)	$ 5,302