Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	ATM	Registered Direct Offering	Common Stock	Common Stock ATM	Common Stock Registered Direct Offering	Additional Paid-in Capital	Additional Paid-in Capital ATM	Additional Paid-in Capital Registered Direct Offering	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Balance at Dec. 31, 2019	$ 41,848			$ 1			$ 82,938			$ 21	$ (41,112)
Balance, Shares at Dec. 31, 2019				17,425,654
Issuance of common stock from follow-on offering, net of issuance costs	35,717			$ 1			35,716
Issuance of common stock from follow-on offering, net of issuance costs,Shares				5,461,169
Issuance of common stock	252	$ 18,115					252	$ 18,115
Issuance of common stock, Shares				83,662	1,714,174
Issuance of common stock under employee stock purchase plan	156						156
Issuance of common stock under employee stock purchase plan, Shares				65,443
Exercise of stock options	7						7
Exercise of stock options, Shares				3,000
Vesting of restricted stock liability	73						73
Stock-based compensation expense	3,817						3,817
Comprehensive income (loss)	(318)									(318)
Net loss	(29,813)										(29,813)
Balance at Dec. 31, 2020	69,854			$ 2			141,074			(297)	(70,925)
Balance, Share at Dec. 31, 2020				24,753,102
Issuance of common stock			$ 29,909						$ 29,909
Issuance of common stock, Shares						4,285,710
Issuance of common stock under employee stock purchase plan	261						261
Issuance of common stock under employee stock purchase plan, Shares				90,402
Exercise of stock options	891						891
Exercise of stock options, Shares				326,454
Vesting of restricted stock liability	73						73
Stock-based compensation expense	4,410						4,410
Comprehensive income (loss)	159									159
Net loss	(39,052)										(39,052)
Balance at Dec. 31, 2021	$ 66,505			$ 2			$ 176,618			$ (138)	$ (109,977)
Balance, Share at Dec. 31, 2021				29,455,668