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Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Product revenue	$ 9,880us-gaap_SalesRevenueGoodsNet	$ 9,566us-gaap_SalesRevenueGoodsNet
Other revenue	56us-gaap_OtherSalesRevenueNet	24us-gaap_OtherSalesRevenueNet
Total revenue	9,936us-gaap_SalesRevenueNet	9,590us-gaap_SalesRevenueNet
Operating expense:
Cost of revenue	7,105us-gaap_CostOfRevenue	7,030us-gaap_CostOfRevenue
Gross profit	2,831us-gaap_GrossProfit	2,560us-gaap_GrossProfit
Research and development expense	1,338us-gaap_ResearchAndDevelopmentExpense	1,679us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative expense	3,215us-gaap_SellingGeneralAndAdministrativeExpense	3,372us-gaap_SellingGeneralAndAdministrativeExpense
Loss from operations	(1,722)us-gaap_OperatingIncomeLoss	(2,491)us-gaap_OperatingIncomeLoss
Interest income	1us-gaap_InterestIncomeOther	2us-gaap_InterestIncomeOther
Interest expense	(6)us-gaap_InterestExpense	(12)us-gaap_InterestExpense
Other, net		23us-gaap_OtherNonoperatingIncomeExpense
Loss before provision for income taxes	(1,727)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(2,478)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (1,727)us-gaap_NetIncomeLoss	$ (2,478)us-gaap_NetIncomeLoss
Net loss per share-basic and diluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of basic and diluted common shares outstanding	28,482,256us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	28,469,393us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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