Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Preferred Stock [Member] Convertible Preferred Stock [Member]	Common Stock [Member]		Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2020			$ 2		$ 505,547	$ (478,211)	$ 27,338
Balance, shares at Dec. 31, 2020	[1]		2,194,284
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs					1,255		1,255
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs, shares	[1]		266,800
Stock-based compensation expense					1,651		1,651
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		22,617
Shares withheld for tax withholding					(139)		(139)
Shares withheld for tax withholding, shares	[1]		(4,664)
Net loss						(17,410)	(17,410)
Issuance of common stock upon exercise of pre-funded warrants					8		8
Issuance of common stock upon exercise of pre-funded warrants, shares	[1]		306,358
Issuance of common stock upon exercise of warrants			$ 1		6,670		6,671
Issuance of common stock upon exercise of warrants, shares	[1]		428,542
Reclassification of warrant liability upon exercise					8,964		8,964
Stock option exercises					3		3
Stock option exercises, shares	[1]		100
Forfeiture of restricted stock awards
Forfeiture of restricted stock awards, shares	[1]		(1,385)
Balance at Mar. 31, 2021			$ 3		523,959	(495,621)	28,341
Balance, shares at Mar. 31, 2021	[1]		3,212,652
Balance at Dec. 31, 2020			$ 2		505,547	(478,211)	27,338
Balance, shares at Dec. 31, 2020	[1]		2,194,284
Net loss							(21,619)
Balance at Sep. 30, 2021			$ 3		526,728	(499,830)	26,901
Balance, shares at Sep. 30, 2021	[1]		3,262,532
Balance at Mar. 31, 2021			$ 3		523,959	(495,621)	28,341
Balance, shares at Mar. 31, 2021	[1]		3,212,652
Stock-based compensation expense					1,640		1,640
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		17,366
Shares withheld for tax withholding					(53)		(53)
Shares withheld for tax withholding, shares	[1]		(2,290)
Net loss						(3,188)	(3,188)
Purchase of ESPP shares					28		28
Purchase of ESPP shares, shares	[1]		1,970
Balance at Jun. 30, 2021			$ 3		525,574	(498,809)	26,768
Balance, shares at Jun. 30, 2021	[1]		3,229,698
Stock-based compensation expense					1,317		1,317
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		41,035
Shares withheld for tax withholding					(163)		(163)
Shares withheld for tax withholding, shares	[1]		(8,201)
Net loss						(1,021)	(1,021)
Balance at Sep. 30, 2021			$ 3		526,728	(499,830)	26,901
Balance, shares at Sep. 30, 2021	[1]		3,262,532
Balance at Dec. 31, 2021			$ 3		527,639	(508,398)	19,244
Balance, shares at Dec. 31, 2021			3,299,379	[1]
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs					1,685		1,685
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs, shares		5,000
Issuance of common stock upon conversion of preferred stock			$ 1		(1)
Issuance of common stock upon conversion of preferred stock, shares		(5,000)	655,738	[1]
Stock-based compensation expense					762		762
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		25,676
Shares withheld for tax withholding					(127)		(127)
Shares withheld for tax withholding, shares	[1]		(7,402)
Net loss						(3,771)	(3,771)
Balance at Mar. 31, 2022			$ 4		529,958	(512,169)	17,793
Balance, shares at Mar. 31, 2022			3,973,391	[1]
Balance at Dec. 31, 2021			$ 3		527,639	(508,398)	19,244
Balance, shares at Dec. 31, 2021			3,299,379	[1]
Net loss							(7,239)
Balance at Sep. 30, 2022			$ 7		532,573	(515,637)	16,943
Balance, shares at Sep. 30, 2022			7,219,974	[1]
Balance at Mar. 31, 2022			$ 4		529,958	(512,169)	17,793
Balance, shares at Mar. 31, 2022			3,973,391	[1]
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs					1,840		1,840
Issuance of common stock and pre-funded warrants through underwritten offering, net of issuance costs, shares	[1]		445,500
Stock-based compensation expense					530		530
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		58,738
Shares withheld for tax withholding					(52)		(52)
Shares withheld for tax withholding, shares	[1]		(13,876)
Net loss						(68)	(68)
Issuance of common stock upon exercise of pre-funded warrants			$ 1				1
Issuance of common stock upon exercise of pre-funded warrants, shares	[1]		488,659
Fractional shares issued for reverse stock split
Fractional shares issued for reverse stock split, shares	[1]		17,024
Purchase of ESPP shares					2		2
Purchase of ESPP shares, shares	[1]		1,800
Balance at Jun. 30, 2022			$ 5		532,278	(512,237)	20,046
Balance, shares at Jun. 30, 2022			4,971,236	[1]
Stock-based compensation expense					297		297
Vesting of restricted stock units
Vesting of restricted stock units, shares	[1]		16,033
Shares withheld for tax withholding					(2)		(2)
Shares withheld for tax withholding, shares	[1]		(1,454)
Net loss						(3,400)	(3,400)
Issuance of common stock upon exercise of pre-funded warrants			$ 2				2
Issuance of common stock upon exercise of pre-funded warrants, shares	[1]		2,234,159
Balance at Sep. 30, 2022			$ 7		$ 532,573	$ (515,637)	$ 16,943
Balance, shares at Sep. 30, 2022			7,219,974	[1]

[1] Giving retroactive effect to the 1-for-25 reverse stock split effectuated on May 16, 2022