Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Other Comprehensive Gain/(Loss) [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2020	$ 31,484	$ 11	$ 370,210	$ (43)	$ (338,528)	$ (166)
Begining balance, Shares at Dec. 31, 2020		11,018,954
Issuance of common stock upon release of restricted stock units, shares		4,177
Issuance of common stock from at-the-market offerings, net of offering costs	9,621	$ 2	9,619
Issuance of common stock from at the market offerings, net of offering costs, shares		1,988,254
Issuance of common stock from committed purchase agreement, net of offering costs	15,236	$ 3	15,233
Issuance of common stock from committed purchase agreement, net of offering costs, shares		3,000,000
Stock-based compensation	360		360
Net unrealized loss on investments, net of tax	(14)			(14)
Net loss	(7,155)				(7,151)	(4)
Ending balance at Mar. 31, 2021	49,532	$ 16	395,422	(57)	(345,679)	(170)
Ending balance, Shares at Mar. 31, 2021		16,011,385
Beginning balance at Dec. 31, 2021	109,126	$ 28	481,832	(263)	(372,296)	(175)
Begining balance, Shares at Dec. 31, 2021		27,793,035
Issuance of common stock upon release of restricted stock units, shares		2,500
Issuance of common stock upon exercise of stock options	$ 1		1
Issuance of common stock upon exercise of stock options, shares	259	259
Issuance of common stock from at-the-market offerings, net of offering costs	$ 1,480		1,480
Issuance of common stock from at the market offerings, net of offering costs, shares		260,455
Stock-based compensation	417		417
Net unrealized loss on investments, net of tax	(496)			(496)
Net loss	(12,154)				(12,153)	(1)
Ending balance at Mar. 31, 2022	$ 98,374	$ 28	$ 483,730	$ (759)	$ (384,449)	$ (176)
Ending balance, Shares at Mar. 31, 2022		28,056,249