CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Series A Convertible Preferred Stock	Series A Convertible Preferred Stock Preferred Stock	Series A Convertible Preferred Stock Common Stock	Series B Convertible Preferred Stock	Series B Convertible Preferred Stock Preferred Stock	Series B Convertible Preferred Stock Additional Paid in Capital
Beginning balance (in shares) at Dec. 31, 2020		184,133,384						7			0
Beginning balance at Dec. 31, 2020	$ 21,550	$ 1,841	$ (48)	$ 93,059	$ 0	$ (73,302)		$ 0			$ 0
Stock-based compensation expense	6,958			6,958
Issuance of common stock for stock option and warrant exercises (in shares)		1,381,799
Issuance of common stock for stock option and warrant exercises	1,262	$ 14		1,248
Issuance of common stock for capital raises, net (in shares)		13,987,000
Issuance of common stock for capital raises, net	119,459	$ 140		119,319
Issuance of stock (in shares)											54,745
Issuance of stock										$ 4,954	$ 1	$ 4,953
Net loss	(58,365)					(58,365)
Ending balance (in shares) at Dec. 31, 2021		199,502,183						7			54,745
Ending balance at Dec. 31, 2021	95,818	$ 1,995	(48)	225,537	0	(131,667)		$ 0			$ 1
Stock-based compensation expense	10,541			10,541
Issuance of common stock for stock option exercises and restricted stock unit vesting, net (in shares)		1,579,886
Issuance of common stock for stock option exercises and restricted stock unit vesting, net	1,262	$ 16		1,246
Issuance of common stock for capital raises, net (in shares)		20,635,998
Issuance of common stock for capital raises, net	57,756	$ 206		57,550
Series A convertible preferred stock conversion (in shares)								7	3,115
Series A convertible preferred stock conversion							$ 0
Other comprehensive income (loss)	26				26
Net loss	(81,351)					(81,351)
Ending balance (in shares) at Dec. 31, 2022		221,721,182						0			54,745
Ending balance at Dec. 31, 2022	$ 84,052	$ 2,217	$ (48)	$ 294,874	$ 26	$ (213,018)		$ 0			$ 1