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, 2020			34,569,254
Beginning balance at Dec. 31, 2020	$ (48,497)		$ 35		$ 137,725		$ (186,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity offering (in shares)			6,550,486
Common stock issued under equity offering	31,069		$ 6		31,063
Cost of common stock issued under equity offering	(1,291)				(1,291)
Shares issued under employee stock purchase plan (in shares)			40,146
Shares issued under employee stock purchase plan	158				158
Exercise of stock options (in shares)			61,000
Exercise of stock options	185				185
Vested restricted stock units (in shares)			7,850
Vested restricted stock units	(14)				(14)
Share-based compensation expense	6,795				6,795
Net loss	(70,539)						(70,539)
Balance (in shares) at Dec. 31, 2021			41,228,736
Ending 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)