Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2019	$ 115,335	$ 2	$ 158,317	$ (43,001)	$ 17
Beginning balance, Shares at Dec. 31, 2019		17,382,047
Issuance of common stock upon exercise of stock options	82		82
Issuance of common stock upon exercise of stock options, Shares		35,265
Stock-based compensation	4,018		4,018
Issuance of common stock upon purchases under employee share purchase plan	52		52
Issuance of common stock upon purchases under employee share purchase plan, Shares		14,766
Issuance of common stock upon net exercise of common stock warrants, Shares		4,900
Other comprehensive income	12				12
Net loss	(47,563)			(47,563)
Ending balance at Dec. 31, 2020	71,936	$ 2	162,469	(90,564)	29
Ending Balance, Shares at Dec. 31, 2020		17,436,978
Issuance of common stock upon exercise of stock options	8		8
Issuance of common stock upon exercise of stock options, Shares		7,932
Issuance of common stock upon initial public offering,net of issuance cost	75,215	$ 1	75,214
Issuance of common stock in private placement financing, net of issuance costs, Shares		14,084,507
Stock-based compensation	5,364		5,364
Issuance of common stock upon purchases under employee share purchase plan	60		60
Issuance of common stock upon purchases under employee share purchase plan, Shares		16,147
Other comprehensive income	(71)				(71)
Net loss	(51,172)			(51,172)
Ending balance at Dec. 31, 2021	$ 101,340	$ 3	$ 243,115	$ (141,736)	$ (42)
Ending Balance, Shares at Dec. 31, 2021		31,545,564