UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME
Beginning balance (in shares) at Dec. 31, 2019		65,378,890
Beginning balance at Dec. 31, 2019	$ 20,320	$ 7	$ 326,777	$ (306,516)	$ 52
Increase (Decrease) in Shareholders' Equity
Net Loss	(7,984)			(7,984)
Unrealized Loss on Available-for-Sale Investments	(7)				(7)
Foreign Currency Translation Adjustments	6				6
Issuance of common stock, net of offering costs/Bought Deal (in shares)		3,670,212
Issuance of common stock, net of offering costs/Bought Deal	8,003		8,003
Issuance of Warrants related to Debt Financing	501		501
Stock-based Compensation expense	935		935
Ending balance (in shares) at Mar. 31, 2020		69,049,102
Ending balance at Mar. 31, 2020	$ 21,774	$ 7	336,216	(314,500)	51
Beginning balance (in shares) at Dec. 31, 2020	93,573,165	93,573,165
Beginning balance at Dec. 31, 2020	$ 34,170	$ 9	371,510	(337,406)	57
Increase (Decrease) in Shareholders' Equity
Net Loss	(7,752)			(7,752)
Unrealized Loss on Available-for-Sale Investments	(7)				(7)
Foreign Currency Translation Adjustments	3				3
Stock-based Compensation expense (in shares)		26,354
Stock-based Compensation expense	$ (236)		(236)
Ending balance (in shares) at Mar. 31, 2021	93,599,519	93,599,519
Ending balance at Mar. 31, 2021	$ 26,178	$ 9	$ 371,274	$ (345,158)	$ 53