Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue:
Product revenue	$ 2,300us-gaap_SalesRevenueGoodsNet	$ 2,576us-gaap_SalesRevenueGoodsNet
Other revenue	10us-gaap_OtherSalesRevenueNet	9us-gaap_OtherSalesRevenueNet
Total revenue	2,310us-gaap_SalesRevenueNet	2,585us-gaap_SalesRevenueNet
Operating expense:
Cost of revenue	1,745us-gaap_CostOfRevenue	1,877us-gaap_CostOfRevenue
Gross profit	565us-gaap_GrossProfit	708us-gaap_GrossProfit
Research and development expenses	302us-gaap_ResearchAndDevelopmentExpense	337us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative expenses	866	798
Loss from operations	(603)us-gaap_OperatingIncomeLoss	(427)us-gaap_OperatingIncomeLoss
Interest expense	(3)us-gaap_InterestExpense	(2)us-gaap_InterestExpense
Other, net	0us-gaap_OtherNonoperatingIncomeExpense	0us-gaap_OtherNonoperatingIncomeExpense
Loss before provision for income taxes	(606)	(429)
Provision for income taxes	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (606)us-gaap_NetIncomeLoss	$ (429)us-gaap_NetIncomeLoss
Net loss per share-basic and diluted	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of basic and diluted common shares outstanding	28,542,533	28,481,496

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