Shareholders' Equity - Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 74,130
Foreign currency translation adjustment	$ (7)	$ (22)	(3)	$ (45)
Net loss	(1,351)	(1,248)	(3,202)	(3,472)
Balance, end of period	42,013	50,078	42,013	50,078
Common stock and additional paid-in capital [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	46,003	74,885	74,934	72,817
Dividends paid	0	0	(28,979)	0
Issuance of common stock and warrants, net	0	0	0	2,000
Share-based compensation expense	33	24	80	90
Proceeds from employee stock purchase plan	3	1	4	3
Balance, end of period	46,039	74,910	46,039	74,910
Accumulated other comprehensive loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(270)	(266)	(288)	(241)
Unrealized loss on available-for-sale securities, net of tax	(31)	0	(17)	(2)
Foreign currency translation adjustment	(7)	(22)	(3)	(45)
Balance, end of period	(308)	(288)	(308)	(288)
Accumulated deficit [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,367)	(23,296)	(516)	(21,072)
Net loss	(1,351)	(1,248)	(3,202)	(3,472)
Balance, end of period	$ (3,718)	$ (24,544)	$ (3,718)	$ (24,544)