Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 7,965	$ 7,772
Restricted cash	5	5
Accounts receivable, net	1,396	1,374
Inventories	1,068	1,195
Prepaid expenses and other current assets	278	338
Total current assets	10,712	10,684
Property, plant and equipment, net	639	525
Intangibles, net	84	69
Deferred income taxes	425	493
Other assets	60	59
Total assets	11,920	11,830
Current liabilities
Accounts payable	363	255
Accrued liabilities	302	345
Accrued income taxes	57	103
Total current liabilities	722	703
Total liabilities	722	703
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, 7,342 and 7,328 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	7	7
Additional paid-in-capital	60,395	60,527
Accumulated other comprehensive income	126	41
Accumulated deficit	(49,330)	(49,448)
Total stockholders' equity	11,198	11,127
Total liabilities and stockholders' equity	$ 11,920	$ 11,830