Statements of changes in convertible preferred stock and stockholders' equity (deficit) - USD ($) $ in Thousands	Series A Preferred Stock Preferred Stock.	Common stock	Additional paid-in capital	Accumulated deficit	Total
Balance at Dec. 31, 2019			$ 927	$ (36,557)	$ (35,630)
Balance (shares) at Dec. 31, 2019		1,099,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series A convertible preferred stock upon IPO		$ 1	48,368		48,369
Conversion of Series A convertible preferred stock upon IPO (shares)		5,670,184
Share-based compensation expense			621		621
Sale of common stock in connection with IPO			38,742		38,742
Sale of common stock in connection with IPO (shares)		3,737,500
Exercise of common stock warrants			7,060		7,060
Exercise of stock options			20		20
Exercise of stock options (shares)		127,291
Net loss				(17,837)	(17,837)
Balance at Dec. 31, 2020		$ 1	95,738	(54,394)	41,345
Balance (shares) at Dec. 31, 2020		10,634,245
Balance at Dec. 31, 2019	$ 38,894
Balance (shares) at Dec. 31, 2019	4,443,259
Increase (Decrease) in Temporary Equity [Roll Forward]
Sale of Series A convertible preferred stock and warrants	$ 9,475
Sale of Series A convertible preferred stock and warrants (shares)	1,226,925
Conversion of Series A convertible preferred stock upon IPO	$ (48,369)
Conversion of Series A convertible preferred stock upon IPO (in shares)	(5,670,184)
Sale of common stock and common stock warrants			26,666		26,666
Sale of common stock and common stock warrants, shares		1,014,115
Share-based compensation expense			3,448		3,448
Exercise of common stock warrants			1,338		1,338
Exercise of common stock warrants (shares)		200,979
Exercise of stock options and vesting of restricted stock			99		99
Exercise of stock options and vesting of restricted stock		261,034
Net loss				(24,711)	(24,711)
Balance at Dec. 31, 2021		$ 1	$ 127,289	$ (79,105)	$ 48,185
Balance (shares) at Dec. 31, 2021		12,110,373