Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 5,761	$ 7,094
Short-term investment securities	30,582	32,556
Accounts receivable, net of allowances of $113 and $104 at December 31, 2020 and December 31, 2019, respectively	16,601	17,380
Inventories, net	9,984	11,935
Prepaid expenses and other assets	1,685	1,842
Total current assets	64,613	70,807
Property and equipment, net	12,505	11,985
Long-term investment securities	4,640	0
Goodwill	3,332	3,332
Intangible assets, net	0	144
Other noncurrent assets	2,441	2,969
TOTAL ASSETS	87,531	89,237
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	4,430	3,190
Accrued liabilities	7,316	9,382
Total current liabilities	11,746	12,572
Long-term liabilities	4,387	3,315
Total liabilities	16,133	15,887
Stockholders’ equity:
Common stock, $0.001 par value, 50,000,000 and 100,000,000 shares authorized at December 31, 2020 and December 31, 2019, respectively, and 18,429,350 and 18,611,289 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	18	19
Additional paid-in capital	128,250	133,954
Accumulated deficit	(56,888)	(60,305)
Accumulated other comprehensive income (loss)	18	(318)
Total stockholders’ equity	71,398	73,350
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 87,531	$ 89,237