Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 8,510	$ 17,578
Short-term investments	10,184	12,136
Accounts receivable, less current expected credit loss of $106 and $111, respectively	9,368	6,729
Inventories, net	397	439
Prepaid expenses and other current assets	1,160	1,439
Total current assets	29,619	38,321
Property and equipment, net	5,084	4,539
Goodwill	2,116	2,116
Other intangible assets, net	327	358
Right-of-use operating lease assets	585	609
Long-term investments	10,875	3,664
Other assets	191	781
Total assets	48,797	50,388
Current liabilities:
Accounts payable	2,915	2,421
Accrued liabilities:
Operating lease liabilities - current	77	81
Employee compensation	1,248	1,252
Other accrued liabilities	1,615	1,934
Total current liabilities	5,855	5,688
Operating lease liabilities - non-current	548	533
Deferred income taxes	176	172
Other liabilities	263	281
Total liabilities	6,842	6,674
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 31,767,329 and 31,361,303 shares issued, and 30,708,273 and 30,385,297 shares outstanding in 2024 and 2023, respectively	317	313
Additional paid-in capital	165,295	164,853
Accumulated deficit	(119,472)	(117,529)
Accumulated other comprehensive loss	(1,915)	(1,748)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost (Note 5)	(2,346)	(2,251)
Total stockholders’ equity	41,955	43,714
Total liabilities and stockholders’ equity	$ 48,797	$ 50,388