CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue, net	$ 30,234us-gaap_SalesRevenueNet	$ 24,859us-gaap_SalesRevenueNet
Cost of goods sold	20,183us-gaap_CostOfGoodsSold	16,206us-gaap_CostOfGoodsSold
Gross profit	10,051us-gaap_GrossProfit	8,653us-gaap_GrossProfit
Operating expenses
Research and development	4,805us-gaap_ResearchAndDevelopmentExpense	3,546us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	1,559us-gaap_SellingAndMarketingExpense	1,333us-gaap_SellingAndMarketingExpense
General and administrative	5,003us-gaap_GeneralAndAdministrativeExpense	3,554us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	11,367us-gaap_OperatingExpenses	8,433us-gaap_OperatingExpenses
Income (loss) from operations	(1,316)us-gaap_OperatingIncomeLoss	220us-gaap_OperatingIncomeLoss
Other income (expense)
Interest income	74us-gaap_InterestAndOtherIncome	79us-gaap_InterestAndOtherIncome
Interest expense	(125)us-gaap_InterestExpense	(162)us-gaap_InterestExpense
Other expense, net	692us-gaap_OtherNonoperatingIncomeExpense	(27)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	641us-gaap_NonoperatingIncomeExpense	(110)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	(675)us-gaap_ProfitLoss	110us-gaap_ProfitLoss
Income taxes	0us-gaap_IncomeTaxExpenseBenefit	(25)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (675)us-gaap_NetIncomeLoss	$ 85us-gaap_NetIncomeLoss
Net income (loss) per share
Basic	$ (0.05)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic
Diluted	$ (0.05)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted
Weighted average shares used to compute net income (loss) per share
Basic	14,844,211	12,792,322
Diluted	14,844,211	13,787,580

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