CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 6,642	$ 6,120
Restricted cash	5	5
Accounts receivable, net	1,106	1,113
Inventories	807	866
Prepaid expenses and other current assets	325	392
Total current assets	8,885	8,496
Property, plant and equipment, net	372	407
Intangible assets, net	146	195
Right-of-use assets	207	334
Deferred tax assets	533	527
Other assets	70	63
Total assets	10,213	10,022
Current liabilities
Accounts payable	233	235
Accrued liabilities	452	343
Lease liabilities, current	150	219
PPP loan payable		186
Accrued income taxes	183	59
Total current liabilities	1,018	1,042
Long-term liabilities
Lease liabilities, long-term	71	140
Total long-term liabilities	71	140
Total liabilities	1,089	1,182
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.01 par value: 1,000 shares authorized, no shares issued or outstanding
Common stock, $0.001 par value: 30,000 shares authorized, 6,602 shares issued and outstanding at September 30, 2021; 6,601 shares issued and outstanding at December 31, 2020	7	7
Additional paid-in-capital	57,986	57,966
Accumulated other comprehensive income	58	37
Accumulated deficit	(48,927)	(49,170)
Total stockholders' equity	9,124	8,840
Total liabilities and stockholders' equity	$ 10,213	$ 10,022