Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Revenue:
Product	$ 24,061us-gaap_SalesRevenueGoodsNet	$ 26,315us-gaap_SalesRevenueGoodsNet
Contract	1,654us-gaap_ContractsRevenue	1,675us-gaap_ContractsRevenue
Total revenue, net	25,715us-gaap_Revenues	27,990us-gaap_Revenues
Cost of goods sold:
Product	17,384us-gaap_CostOfGoodsSold	18,573us-gaap_CostOfGoodsSold
Contract	946us-gaap_ContractRevenueCost	991us-gaap_ContractRevenueCost
Total cost of goods sold	18,330us-gaap_CostOfRevenue	19,564us-gaap_CostOfRevenue
Gross profit	7,385us-gaap_GrossProfit	8,426us-gaap_GrossProfit
Operating expenses:
Research and development	4,511us-gaap_ResearchAndDevelopmentExpense	5,023us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	8,125	8,605
Total operating expenses	12,636us-gaap_OperatingExpenses	13,628us-gaap_OperatingExpenses
Loss from operations	(5,251)us-gaap_OperatingIncomeLoss	(5,202)us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense, net	(28)us-gaap_InterestExpense	(31)us-gaap_InterestExpense
Other income, net	22us-gaap_OtherIncome	50us-gaap_OtherIncome
Total other income (expense), net	(6)us-gaap_NonoperatingIncomeExpense	19us-gaap_NonoperatingIncomeExpense
Loss before provision for income taxes	(5,257)	(5,183)
Provision for income taxes		8,884us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (5,257)us-gaap_NetIncomeLoss	$ (14,067)us-gaap_NetIncomeLoss
Loss per share, basic	$ (0.22)us-gaap_EarningsPerShareBasic	$ (0.60)us-gaap_EarningsPerShareBasic
Loss per share, diluted	$ (0.22)us-gaap_EarningsPerShareDiluted	$ (0.60)us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding:
Basic	24,376,259	23,639,554
Diluted	24,376,259	23,639,554

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