Unaudited Condensed Consolidated Statement of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance (shares) at Dec. 31, 2019		86,762,463
Balance at Dec. 31, 2019	$ (18,069)	$ 9	$ 30,888	$ (48,966)
Share-based compensation	57		57
Net loss	(5,562)			(5,562)
Balance (shares) at Mar. 31, 2020		86,762,463
Balance at Mar. 31, 2020	(23,574)	$ 9	30,945	(54,528)
Balance (shares) at Dec. 31, 2020		169,316,421
Balance at Dec. 31, 2020	640,168	$ 19	364,998	275,151
Common stock issued for warrants exercised, net of issuance costs	4,282		4,282
Common stock issued for warrants exercised, net of issuance costs (shares)		371,535
Exercise of common stock options	287		287
Exercise of common stock options (shares)		1,831,855
Share-based compensation	1,510		1,510
Net loss	(16,562)			(16,562)
Balance (shares) at Mar. 31, 2021		171,519,811
Balance at Mar. 31, 2021	$ 629,685	$ 19	$ 371,077	$ 258,589