CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 7,772	$ 6,009
Restricted cash	5	5
Accounts receivable, net	1,374	1,726
Inventories	1,195	1,268
Prepaid expenses and other current assets	338	377
Total current assets	10,684	9,385
Property, plant and equipment, net	525	310
Intangibles, net	69	44
Deferred income taxes	493	675
Other assets	59	57
Total assets	11,830	10,471
Current liabilities
Accounts payable	255	324
Accrued liabilities	345	334
Accrued income taxes	103	104
Deferred revenue, current		111
Total current liabilities	703	873
Total liabilities	703	873
Commitments and contingencies (see note 9)
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, 7,336 and 7,328 shares issued and outstanding at December 31, 2017 and December 31, 2016, respectively	7	7
Additional paid-in-capital	60,527	60,370
Accumulated other comprehensive (loss) income	41	(71)
Accumulated deficit	(49,448)	(50,708)
Total stockholders' equity	11,127	9,598
Total liabilities and stockholders' equity	$ 11,830	$ 10,471