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, 2020		8,506,651
Beginning balance at Dec. 31, 2020	$ 34,170	$ 1	$ 371,518	$ (337,406)	$ 57
Increase (Decrease) in Shareholders' Equity
Net Loss	(7,752)			(7,752)
Unrealized Gain (Loss) on Available-for-Sale Debt Instrument Investments	(7)				(7)
Foreign Currency Translation Adjustments	3				3
Stock-based Compensation expense (in shares)		2,396
Stock-based Compensation expense	(236)		(236)
Ending balance (in shares) at Mar. 31, 2021		8,509,047
Ending balance at Mar. 31, 2021	$ 26,178	$ 1	371,282	(345,158)	53
Beginning balance (in shares) at Dec. 31, 2021	8,544,225	8,544,225
Beginning balance at Dec. 31, 2021	$ 2,535	$ 1	372,562	(370,080)	52
Increase (Decrease) in Shareholders' Equity
Net Loss	(7,162)			(7,162)
Unrealized Gain (Loss) on Available-for-Sale Debt Instrument Investments	0
Foreign Currency Translation Adjustments	(1)				(1)
Stock-based Compensation expense (in shares)		0
Stock-based Compensation expense	$ (179)		(179)
Ending balance (in shares) at Mar. 31, 2022	8,544,225	8,544,225
Ending balance at Mar. 31, 2022	$ (4,807)	$ 1	$ 372,383	$ (377,242)	$ 51