Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	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, 2018	75,501,394
Balance at Dec. 31, 2018	$ 75	414,001	(406,924)	7,152
Net loss				(11,850)
Balance (in shares) at Sep. 30, 2019	97,238,427
Balance at Sep. 30, 2019	$ 97	430,504	(418,774)	11,827
Balance (in shares) at Mar. 31, 2019	75,532,748
Balance at Mar. 31, 2019	$ 75	414,202	(410,640)	3,637
Net loss			(4,314)	(4,314)
Common stock issued for restricted stock awards (in shares)	95,452
Common stock issued for restricted stock awards		123		123
Common stock issued in conjunction with public offering, net of issuance costs (in shares)	18,750,000
Common stock issued in conjunction with public offering, net of issuance costs	$ 19	13,611		13,630
Stock compensation charge		290		290
Balance (in shares) at Jun. 30, 2019	94,378,200
Balance at Jun. 30, 2019	$ 94	428,226	(414,954)	13,366
Net loss			(3,820)	(3,820)
Common stock issued for restricted stock awards (in shares)	47,727
Common stock issued for restricted stock awards		62		62
Common stock issued in conjunction with public offering, net of issuance costs (in shares)	2,812,500
Common stock issued in conjunction with public offering, net of issuance costs	$ 3	2,089		2,092
Issuance costs related to public offering		(107)		(107)
Stock compensation charge		234		234
Balance (in shares) at Sep. 30, 2019	97,238,427
Balance at Sep. 30, 2019	$ 97	430,504	(418,774)	11,827
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
Balance (in shares) at Dec. 31, 2019	97,286,157
Balance at Dec. 31, 2019	$ 97	430,802	(422,161)	8,738
Net loss				(11,824)
Balance (in shares) at Sep. 30, 2020	104,041,493
Balance at Sep. 30, 2020	$ 104	448,431	(433,985)	14,550
Balance (in shares) at Mar. 31, 2020	97,288,657
Balance at Mar. 31, 2020	$ 97	431,072	(425,867)	5,302
Net loss			(3,831)	(3,831)
Common stock issued in conjunction with exercise of stock options (in shares)	247,625
Common stock issued in conjunction with exercise of stock options		295		295
Common stock issued for restricted stock awards (in shares)	178,470
Common stock issued for restricted stock awards		121		121
Common stock issued in conjunction with warrant exercise (in shares)	2,810,338
Common stock issued in conjunction with warrant exercise	$ 4	5,056		5,060
Stock compensation charge		320		320
Balance (in shares) at Jun. 30, 2020	100,525,090
Balance at Jun. 30, 2020	$ 101	436,864	(429,698)	7,267
Net loss			(4,287)	(4,287)
Common stock issued in conjunction with exercise of stock options (in shares)	277,167
Common stock issued in conjunction with exercise of stock options		508		508
Common stock issued for restricted stock awards (in shares)	89,236
Common stock issued for restricted stock awards		61		61
Stock compensation charge		349		349
Common stock issued in conjunction with private placement, net of issuance costs, (in shares)	3,150,000
Common stock issued in conjunction with private placement, net of issuance costs	$ 3	10,649		10,652
Balance (in shares) at Sep. 30, 2020	104,041,493
Balance at Sep. 30, 2020	$ 104	$ 448,431	$ (433,985)	$ 14,550