Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Total	Private equity	Common Stock	Common Stock Private equity	Additional Paid-in Capital	Additional Paid-in Capital Private equity	Accumulated Deficit
Balance (in shares) at Dec. 31, 2021			41,228,736
Beginning balance at Dec. 31, 2021	$ (82,134)		$ 41		$ 174,621		$ (256,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Fair value of warrants issued	5,874				5,874
Common stock issued under equity offering (in shares)			2,860,538	6,686,491
Common stock issued under equity offering	4,196	$ 4,629	$ 3	$ 7	4,193	$ 4,622
Cost of common stock issued under equity offering	(289)	$ (824)			(289)	$ (824)
Common stock issued upon warrant exercises (in shares)			4,000,000
Common Stock issued upon warrant exercises	0		$ 4		(4)
Shares issued under employee stock purchase plan (in shares)			45,304
Shares issued under employee stock purchase plan	34				34
Vested restricted stock units (in shares)			6,665
Vested restricted stock units	(3)				(3)
Share-based compensation expense	4,371				4,371
Other	2				3		(1)
Net loss	(54,410)						(54,410)
Balance (in shares) at Dec. 31, 2022			54,827,734
Ending balance at Dec. 31, 2022	(118,554)		$ 55		192,598		(311,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity offering (in shares)			4,958,341
Common stock issued under equity offering	9,464		$ 5		9,459
Cost of common stock issued under equity offering	(552)				(552)
Common stock issued upon warrant exercises (in shares)			8,689,452
Common Stock issued upon warrant exercises	8,342		$ 9		8,333
Costs of common stock issued under private equity offering	(35)				(35)
Shares issued under employee stock purchase plan (in shares)			36,168
Shares issued under employee stock purchase plan	66				66
Vested restricted stock units (in shares)			19,515
Vested restricted stock units	(11)				(11)
Share-based compensation expense	2,662				2,662
Options, exercises (in shares)			1,875
Options exercised	1				1
Other	0				0		0
Net loss	(7,870)						(7,870)
Balance (in shares) at Dec. 31, 2023			68,533,085
Ending balance at Dec. 31, 2023	$ (106,487)		$ 69		$ 212,521		$ (319,077)