Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2020	$ 54	$ 77,680	$ (75,162)	$ 2,572
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	54,535,891
Stock-based compensation expense		705		705
Stock Issued During Period, Shares, Conversion of Convertible Securities	6,146,125
Issuance of common stock, net of issuance costs	$ 18	33,463		33,481
Issuance of common stock, options exercised		65		65
Stock Issued During Period, Shares, New Issues	17,530,488
Warrants exercised for cash	$ 6	7,017		7,023
Ending balance, value at Mar. 31, 2021	$ 78	118,960	(94,278)	24,760
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	29,999
Issuance of common stock, ESPP		30		30
Stock Issued During Period, Shares, Employee Stock Ownership Plan	40,518
Net loss			(19,116)	(19,116)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2021	78,283,021
Beginning balance, value at Dec. 31, 2020	$ 54	77,680	(75,162)	2,572
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	54,535,891
Ending balance, value at Dec. 31, 2021	$ 105	198,428	(141,210)	$ 57,323
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2021	105,500,445			105,500,445
Stock-based compensation expense		2,232		$ 2,232
Issuance of common stock, options exercised		8		8
Ending balance, value at Mar. 31, 2022	$ 105	200,743	(155,211)	$ 45,637
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	6,250			6,250
Issuance of common stock, ESPP		75		$ 75
Stock Issued During Period, Shares, Employee Stock Ownership Plan	84,078
Net loss			$ (14,001)	$ (14,001)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2022	105,590,773			105,590,773