CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	At-The-Market Offering	Public Offering	Common Stock	Common Stock At-The-Market Offering	Common Stock Public Offering	Additional Paid-in Capital	Additional Paid-in Capital At-The-Market Offering	Additional Paid-in Capital Public Offering	Accumulated Deficit
Beginning balance at Dec. 31, 2020	$ 14,567			$ 2			$ 302,655			$ (288,090)
Beginning balance, shares at Dec. 31, 2020				18,787,579
Exercise of options to purchase common stock	316						316
Exercise of options to purchase common stock, shares				46,807
Stock-based compensation	2,273						2,273
Net loss	(10,308)									(10,308)
Issuance of common stock upon offering, net of issuance costs			$ 61,868						$ 61,868
Issuance of common stock upon offering, net of issuance costs, shares						3,162,500
Ending balance at Mar. 31, 2021	68,716			$ 2			367,112			(298,398)
Ending balance, shares at Mar. 31, 2021				21,996,886
Beginning balance at Dec. 31, 2021	53,505			$ 2			378,750			(325,247)
Beginning balance, shares at Dec. 31, 2021				22,383,830
Stock-based compensation	2,349						2,349
Net loss	(8,028)									(8,028)
Issuance of common stock upon offering, net of issuance costs		$ 553						$ 553
Issuance of common stock upon offering, net of issuance costs, shares		110,037			110,037
Ending balance at Mar. 31, 2022	$ 48,379			$ 2			$ 381,652			$ (333,275)
Ending balance, shares at Mar. 31, 2022				22,493,867