Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balances at Dec. 31, 2020	$ 21,147		$ 174,349	$ (153,202)
Balance (in shares) at Dec. 31, 2020		63
Common stock issued, net	65		65
Common stock issued, net (in shares)		1
Stock-based compensation	1,169		1,169
Stock-based compensation (In shares)		1
Net loss	(7,236)			(7,236)
Balances at Mar. 31, 2021	15,145		175,583	(160,438)
Balance (in shares) at Mar. 31, 2021		65
Balances at Dec. 31, 2020	21,147		174,349	(153,202)
Balance (in shares) at Dec. 31, 2020		63
Net loss	(16,783)
Balances at Sep. 30, 2021	21,549		191,534	(169,985)
Balance (in shares) at Sep. 30, 2021		140
Balances at Mar. 31, 2021	15,145		175,583	(160,438)
Balance (in shares) at Mar. 31, 2021		65
Common stock issued, net	10,645		10,645
Common stock issued, net (in shares)		52
Common stock issued pursuant to the vesting of restricted stock units and purchases under the employee stock purchase plan	26		26
Stock-based compensation	696		696
Stock-based compensation (In shares)		1
Net loss	(5,249)			(5,249)
Balances at Jun. 30, 2021	21,263		186,950	(165,687)
Balance (in shares) at Jun. 30, 2021		118
Common stock issued, net	4,350		4,350
Common stock issued, net (in shares)		22
Warrant issued	132		132
Stock-based compensation	102		102
Net loss	(4,298)			(4,298)
Balances at Sep. 30, 2021	21,549		191,534	(169,985)
Balance (in shares) at Sep. 30, 2021		140
Balances at Dec. 31, 2021	13,673		191,945	(178,272)
Balance (in shares) at Dec. 31, 2021		140
Common stock and warrants issued, net	9,740		9,740
Common stock and warrants issued, net (in shares)		505
Warrants exercised	25		25
Warrants exercised (in shares)		1
Stock-based compensation	165		165
Net loss	(5,495)			(5,495)
Balances at Mar. 31, 2022	18,108		201,875	(183,767)
Balance (in shares) at Mar. 31, 2022		646
Balances at Dec. 31, 2021	13,673		191,945	(178,272)
Balance (in shares) at Dec. 31, 2021		140
Net loss	(18,706)
Balances at Sep. 30, 2022	12,510		209,488	(196,978)
Balance (in shares) at Sep. 30, 2022		1,423
Balances at Mar. 31, 2022	18,108		201,875	(183,767)
Balance (in shares) at Mar. 31, 2022		646
Common stock issued pursuant to the vesting of restricted stock units and purchases under the employee stock purchase plan	5		5
Restricted stock awards cancelled		(1)
Stock-based compensation	126		126
Net loss	(8,448)			(8,448)
Balances at Jun. 30, 2022	9,791		202,006	(192,215)
Balance (in shares) at Jun. 30, 2022		645
Common stock and warrants issued, net	1,172		1,172
Common stock and warrants issued, net (in shares)		333
Warrants exercised	6,236		6,236
Warrants exercised (in shares)		445
Stock-based compensation	74		74
Net loss	(4,763)			(4,763)
Balances at Sep. 30, 2022	$ 12,510		$ 209,488	$ (196,978)
Balance (in shares) at Sep. 30, 2022		1,423