Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2020	$ (132,245)					$ 4,454		$ (136,699)
Temporary Equity, Balance, shares at Dec. 31, 2020		11,563,819	10,154,819	6,734,590
Temporary Equity, Balance at Dec. 31, 2020		$ 46,567	$ 51,084	$ 35,573
Balance, shares at Dec. 31, 2020					1,445,065
Stock option exercises, shares					0
Stock-based compensation expense	188					188
Net income (Loss)	(6,582)							(6,582)
Balance at Mar. 31, 2021	(138,639)					4,642		(143,281)
Temporary Equity, Balance, shares at Mar. 31, 2021		11,563,819	10,154,819	6,734,590
Temporary Equity, Balance at Mar. 31, 2021		$ 46,567	$ 51,084	$ 35,573
Balance, shares at Mar. 31, 2021					1,445,065
Balance at Dec. 31, 2021	$ 17,284				$ 4	138,181		(120,901)
Temporary Equity, Balance, shares at Dec. 31, 2021
Temporary Equity, Balance at Dec. 31, 2021
Balance, shares at Dec. 31, 2021	40,389,975				40,389,975
Stock option exercises	$ 3					3
Stock option exercises, shares	4,828				4,828
Issuance of common stock, net of issuance costs, shares					700,549
Issuance of common stock, net of issuance costs, value	$ 3,791					3,791
Stock-based compensation expense	1,137					1,137
Unrealized loss on short-term investments	(50)						(50)
Net income (Loss)	3,069							3,069
Balance at Mar. 31, 2022	$ 25,234				$ 4	$ 143,112	$ (50)	$ (117,832)
Temporary Equity, Balance, shares at Mar. 31, 2022
Temporary Equity, Balance at Mar. 31, 2022
Balance, shares at Mar. 31, 2022	41,095,352				41,095,352