Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2020	$ 270,126	$ 49,314	$ (448)	$ (319,664)	$ (672)
Common Stock, Shares, Outstanding, Beginning Balance, shares at Dec. 31, 2020	23,214
Issuance of shares of common stock in underwritten public offering	$ 24,451				24,451
Stock issued during period shares common stock in underwritten public offering	4,650
Warrants exercised	$ 15				15
[custom:StockIssuedDuringPeriodSharesStockOptionsWarrantsExercised]	44
Stock-based compensation expense		19			19
Net loss				(2,843)	(2,843)
Foreign currency translation adjustment			36		36
Ending balance, value at Mar. 31, 2021	$ 294,592	49,333	(412)	(322,507)	21,006
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2021	27,908
Beginning balance, value at Dec. 31, 2021	$ 347,940	49,389	(379)	(328,585)	68,365
Common Stock, Shares, Outstanding, Beginning Balance, shares at Dec. 31, 2021	39,409
Stock-based compensation expense		13			13
Net loss				(2,212)	(2,212)
Foreign currency translation adjustment			(13)		(13)
Ending balance, value at Mar. 31, 2022	$ 347,940	$ 49,402	$ (392)	$ (330,797)	$ 66,153
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2022	39,409				39,409