Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 4,615	$ 4,435
Accounts receivable, net	1,798	1,599
Inventories	1,183	1,015
Prepaid expenses and other current assets	219	298
Total current assets	7,815	7,347
Property, plant and equipment, net	159	176
Intangibles, net	11	13
Other assets	57	26
Total assets	8,042	7,562
Current liabilities:
Accounts payable	401	484
Accrued liabilities	246	304
Deferred revenue, current	71	71
Total current liabilities	718	859
Deferred revenue, long term	26	40
Total liabilities	$ 744	$ 899
Commitments and contingencies (See note 9)
Stockholders' equity:
Common stock, $0.001 par value: 30,000 shares authorized, 7,326 and 7,326 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 7	$ 7
Additional paid-in-capital	60,276	60,251
Accumulated deficit	(52,985)	(53,595)
Total stockholders' equity	7,298	6,663
Total liabilities and stockholders' equity	$ 8,042	$ 7,562