Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 23,328	$ 35,893
Restricted cash	0	891
Short-term investments	2,981	0
Accounts receivable, net	7,729	3,259
Inventories, net	392	348
Prepaid expenses and other current assets	1,395	1,074
Total current assets	35,825	41,465
Property and equipment, net	4,435	4,609
Goodwill	2,116	2,116
Other intangible assets, net	397	448
Restricted cash included in long-term assets	0	270
Right-of-use operating lease assets	197	242
Long-term investments	6,360	0
Other assets	794	824
Total assets	50,124	49,974
Current liabilities:
Accounts payable	2,710	1,561
Accrued liabilities:
Operating lease liabilities - current	125	113
Employee compensation	1,105	688
Other accrued liabilities	826	861
Total current liabilities	4,766	3,223
Operating lease liabilities - non-current	66	122
Deferred income taxes	177	139
Other liabilities	274	290
Total liabilities	5,283	3,774
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 31,272,303 and 31,227,300 shares issued, and 30,296,297 and 30,263,791 shares outstanding in 2022 and 2021, respectively	313	312
Additional paid-in capital	164,422	164,199
Accumulated deficit	(115,991)	(114,549)
Accumulated other comprehensive loss	(1,728)	(1,604)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost (Note 5)	(2,251)	(2,234)
Total stockholders’ equity	44,841	46,200
Total liabilities and stockholders’ equity	$ 50,124	$ 49,974