Condensed Consolidated Statements of Changes in Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance (in shares) at Dec. 31, 2020		34,569,254
Balance at Dec. 31, 2020	$ (48,497)	$ 35	$ 137,725	$ (186,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock issued under public equity offering (in shares)		1,672,104
Common Stock issued under public equity offering	10,197	$ 1	10,196
Costs of common stock issued under public equity offering	(306)		(306)
Share-based compensation expense	1,507		1,507
Other	(27)		(27)
Net loss	(14,672)			(14,672)
Balance (in shares) at Mar. 31, 2021		36,241,358
Balance at Mar. 31, 2021	(51,798)	$ 36	149,095	(200,929)
Balance (in shares) at Dec. 31, 2021		41,228,736
Balance at Dec. 31, 2021	(82,134)	$ 41	174,621	(256,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock issued under public equity offering (in shares)		391,652
Common Stock issued under public equity offering	1,360		1,360
Costs of common stock issued under public equity offering	(62)		(62)
Share-based compensation expense	913		913
Other	0		1	(1)
Net loss	(13,220)			(13,220)
Balance (in shares) at Mar. 31, 2022		41,620,388
Balance at Mar. 31, 2022	$ (93,143)	$ 41	$ 176,833	$ (270,017)