Condensed Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Total	Private equity	Public equity	Common Stock	Common Stock Private equity	Common Stock Warrant exercises	Common Stock Public equity	Additional Paid-in Capital	Additional Paid-in Capital Private equity	Additional Paid-in Capital Warrant exercises	Additional Paid-in Capital Public equity	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 (in shares)							1,672,104
Common stock issued, value			$ 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, 2020				34,569,254
Balance at Dec. 31, 2020	(48,497)			$ 35				137,725				(186,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(27,039)
Balance (in shares) at Jun. 30, 2021				38,568,242
Balance at Jun. 30, 2021	(53,769)			$ 39				159,488				(213,296)
Balance (in shares) at Mar. 31, 2021				36,241,358
Balance at Mar. 31, 2021	(51,798)			$ 36				149,095				(200,929)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)							2,304,949
Common stock issued, value			9,241				$ 3				9,238
Costs of common stock issued under public equity offering			(627)								(627)
Shares issued under employee stock purchase plan (in shares)				19,270
Shares issued under employee stock purchase plan	76							76
Share-based compensation expense	1,710							1,710
Vested restricted stock units (in shares)				2,665
Vested restricted stock units	(4)							(4)
Net loss	(12,367)											(12,367)
Balance (in shares) at Jun. 30, 2021				38,568,242
Balance at Jun. 30, 2021	(53,769)			$ 39				159,488				(213,296)
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 (in shares)							391,652
Common stock issued, value			1,360								1,360
Costs of common stock issued under public equity offering			(62)								(62)
Share-based compensation expense	913							913
Other								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)
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]
Net loss	(29,522)
Balance (in shares) at Jun. 30, 2022				53,343,989
Balance at Jun. 30, 2022	(96,357)			$ 53				189,908				(286,318)
Balance (in shares) at Mar. 31, 2022				41,620,388
Balance at Mar. 31, 2022	(93,143)			$ 41				176,833				(270,017)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Fair value of warrants issued								5,874
Common stock issued (in shares)					6,686,491	4,000,000	1,013,226
Common stock issued, value		$ 4,629	1,252		$ 7	$ 4	$ 1		$ 4,622	$ (4)	1,251
Costs of common stock issued under public equity offering		$ (824)	$ (77)						$ (824)		$ (77)
Shares issued under employee stock purchase plan (in shares)				23,884
Shares issued under employee stock purchase plan	15							15
Share-based compensation expense	2,219							2,219
Vested restricted stock units								0
Other								(1)				1
Net loss	(16,302)											(16,302)
Balance (in shares) at Jun. 30, 2022				53,343,989
Balance at Jun. 30, 2022	$ (96,357)			$ 53				$ 189,908				$ (286,318)