CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Subscription Agreements	Pre-Merger Financing	Reverse Asset Acquisition	Warrant Exercises	At-the-Market Issuance	Registered Direct Offering	Series B Convertible Preferred Stock	Preferred Stock Series A Convertible Preferred Stock	Preferred Stock Series A Convertible Preferred Stock Reverse Asset Acquisition	Preferred Stock Series B Convertible Preferred Stock	Common Stock	Common Stock Subscription Agreements	Common Stock Pre-Merger Financing	Common Stock Reverse Asset Acquisition	Common Stock Warrant Exercises	Common Stock At-the-Market Issuance	Common Stock Registered Direct Offering	Treasury Stock	Additional Paid in Capital	Additional Paid in Capital Subscription Agreements	Additional Paid in Capital Pre-Merger Financing	Additional Paid in Capital Reverse Asset Acquisition	Additional Paid in Capital Warrant Exercises	Additional Paid in Capital At-the-Market Issuance	Additional Paid in Capital Registered Direct Offering	Additional Paid in Capital Series B Convertible Preferred Stock	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018									0		0	4,960,552
Beginning balance at Dec. 31, 2018	$ (12,709)								$ 0		$ 0	$ 50							$ 0	$ 18,478								$ (31,237)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	$ 884																			884
Issuance of stock (in shares)										7			80,569	4,385,964	1,651,748	40,542,222
Issuance of stock		$ 1,000	$ 13,150	$ 3,566	$ 183								$ 1	$ 44	$ 17	$ 405					$ 999	$ 13,106	$ 3,549	$ (222)
Conversion of debt (in shares)	1,100,000											1,125,673
Conversion of debt	$ 13,980											$ 11								13,969
Reclassification of Series B Warrants from liability to equity	11,256																			11,256
Repurchase of treasury stock	(48)																		(48)
Net loss	(20,243)																											(20,243)
Ending balance (in shares) at Dec. 31, 2019									7		0	52,746,728
Ending balance at Dec. 31, 2019	11,019								$ 0		$ 0	$ 528							(48)	62,019								(51,480)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	660																			660
Issuance of stock (in shares)																1,328,405	108,137,431
Issuance of stock					$ 332	$ 36,339										$ 13	$ 1,081							$ 319	$ 35,258
Warrant exchange (in shares)												21,920,820
Warrant Exchange	(4,978)											$ 219								(5,197)
Net loss	(21,822)																											(21,822)
Ending balance (in shares) at Dec. 31, 2020									7		0	184,133,384
Ending balance at Dec. 31, 2020	21,550								$ 0		$ 0	$ 1,841							(48)	93,059								(73,302)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	6,958																			6,958
Issuance of stock (in shares)											54,745						987,000	13,000,000
Issuance of stock						$ 4,849	$ 114,610	$ 4,954			$ 1						$ 10	$ 130							$ 4,839	$ 114,480	$ 4,953
Issuance of common stock for option and warrant exercises (in shares)												1,381,799
Issuance of common stock for option and warrant exercises	1,262											$ 14								1,248
Net loss	(58,365)																											(58,365)
Ending balance (in shares) at Dec. 31, 2021									7		54,745	199,502,183
Ending balance at Dec. 31, 2021	$ 95,818								$ 0		$ 1	$ 1,995							$ (48)	$ 225,537								$ (131,667)