Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 2,562	$ 3,949
Marketable securities	4,283	4,854
Trade accounts receivable, less allowances of $54 and $39, respectively	3,395	2,781
Inventories	3,167	2,219
Prepaid expenses and other current assets	710	350
Total current assets	14,117	14,153
Machinery and equipment	6,064	6,036
Leasehold improvements	332	332
Furniture and fixtures	400	400
	6,796	6,768
Less-accumulated depreciation and amortization	(6,531)	(6,434)
Total property and equipment, net	265	334
Capitalized software, net	113	175
Other assets	624	516
Total assets	15,119	15,178
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable	1,572	777
Deferred revenue	1,021	375
Accrued liabilities	1,442	1,149
Accrued compensation	195	221
Total current liabilities	4,230	2,522
Deferred lease obligations	38	103
Long-term debt	3,500	3,500
Total liabilities	7,768	6,125
Commitments and Contingencies
Common stock, $0.10 par value; 100,000,000 shares authorized; 7,011,146 and 7,006,310 shares issued and outstanding, respectively	701	701
Additional paid in capital	46,284	45,730
Retained deficit	(38,722)	(36,493)
Cumulative other comprehensive loss	(912)	(885)
Total shareholders' equity	7,351	9,053
Total liabilities and shareholders' equity	$ 15,119	$ 15,178