Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Common Stock Issuable	Accumulated Deficit
Balance, shares at Dec. 31, 2020		59,476,268
Balance, amount at Dec. 31, 2020	$ 21,279	$ 60	$ 101,807	$ 665	$ (81,253)
Issuance of common stock for professional services, shares		265,512
Issuance of common stock for professional services, amount	508	$ 0	363	145
Issuance of common stock from the equity incentive plan, shares		157,693
Issuance of common stock from the equity incentive plan, amount	138	$ 0	190	(52)
Issuance of common stock for exercise of warrants, shares		26,936
Issuance of common stock for exercise of warrants, amount	0	$ 0	0	0
Fair value of stock options and restricted stock granted	961		961
Fair value of restricted stock units granted	144		144
Net loss	(3,171)				(3,171)
Balance, shares at Mar. 31, 2021		59,926,409
Balance, amount at Mar. 31, 2021	19,859	$ 60	103,465	758	(84,424)
Balance, shares at Dec. 31, 2021		68,201,900
Balance, amount at Dec. 31, 2021	16,112	$ 69	110,146	343	(94,446)
Fair value of stock options and restricted stock granted	103		103
Fair value of restricted stock units granted	352		352
Net loss	(5,151)				(5,151)
Issuance of common stock for professional services	17			17
Issuance of common stock from conversion of convertible promissory notes, shares		1,665,000
Issuance of common stock from conversion of convertible promissory notes, amount	666	$ 2	664
Balance, shares at Mar. 31, 2022		69,866,900
Balance, amount at Mar. 31, 2022	$ 12,099	$ 71	$ 111,265	$ 360	$ (99,597)