Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 4,429	$ 7,094
Short-term investment securities	33,103	32,556
Accounts receivable, net of allowances of $115 and $104 at June 30, 2020 and December 31, 2019, respectively	13,955	17,380
Inventories, net	10,290	11,935
Prepaid expenses and other assets	1,207	1,842
Total current assets	62,984	70,807
Property and equipment, net	12,728	11,985
Long-term investment securities	3,735	0
Goodwill	3,332	3,332
Intangible assets, net	0	144
Other noncurrent assets	2,492	2,969
TOTAL ASSETS	85,271	89,237
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	2,279	3,190
Accrued liabilities	7,094	9,382
Total current liabilities	9,373	12,572
Long-term liabilities	4,557	3,315
Total liabilities	13,930	15,887
Stockholders’ equity:
Common stock, $0.001 par value, 50,000,000 and 100,000,000 shares authorized at june 30, 2020 and december 31, 2019, respectively, and 18,640,295 and 18,611,289 shares issued and outstanding at june 30, 2020 and december 31, 2019, respectively	19	19
Additional paid-in capital	130,267	133,954
Accumulated deficit	(58,759)	(60,305)
Accumulated other comprehensive loss	(186)	(318)
Total stockholders’ equity	71,341	73,350
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 85,271	$ 89,237