CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Public offering	At -the-market	COMMON STOCK	COMMON STOCK Public offering	COMMON STOCK At -the-market	ADDITIONAL PAID-IN CAPITAL	ADDITIONAL PAID-IN CAPITAL Public offering	ADDITIONAL PAID-IN CAPITAL At -the-market	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS)
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	(30,890)									(30,890)
Unrealized Loss on Available-for-Sale Investments	(3)										(3)
Foreign Currency Translation Adjustments	8										8
Issuance of Common Stock (in shares)				0
Issuance of Common Stock	0						0
Vesting of Restricted Stock Units Issued, net of taxes withheld (in shares)				216,646
Vesting of Restricted Stock Units Issued, net of taxes withheld	(19)						(19)
Issuance of Common Stock, net of Issuance costs/Public offering (in shares)					26,849,021	1,128,608
Issuance of Common Stock, net of Issuance Costs/Public offering		$ 40,679	$ 2,262		$ 2			$ 40,677	$ 2,262
Issuance of Warrants related to Debt Financing	501						501
Warrant Modification Expense	837						837
Stock-based Compensation	$ 475						475
Ending balance (in shares) at Dec. 31, 2020	93,573,165			93,573,165
Ending balance at Dec. 31, 2020	$ 34,170			$ 9			371,510			(337,406)	57
Increase (Decrease) in Shareholders' Equity
Net Loss	(32,674)									(32,674)
Unrealized Loss on Available-for-Sale Investments	(6)										(6)
Foreign Currency Translation Adjustments	1										1
Vesting of Restricted Stock Units Issued, net of taxes withheld (in shares)				258,305
Vesting of Restricted Stock Units Issued, net of taxes withheld	(6)						(6)
Issued shares for services (in shares)				155,000
Issued shares for services	107						107
Stock-based Compensation	$ 943						943
Ending balance (in shares) at Dec. 31, 2021	93,986,470			93,986,470
Ending balance at Dec. 31, 2021	$ 2,535			$ 9			$ 372,554			$ (370,080)	$ 52