CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Product sales	$ 140,670us-gaap_SalesRevenueGoodsNet	$ 209,175us-gaap_SalesRevenueGoodsNet	$ 212,210us-gaap_SalesRevenueGoodsNet
Services	22,871us-gaap_SalesRevenueServicesNet	15,489us-gaap_SalesRevenueServicesNet	8,441us-gaap_SalesRevenueServicesNet
Total revenues	163,541us-gaap_Revenues	224,664us-gaap_Revenues	220,651us-gaap_Revenues
Cost of revenues:
Product sales	31,400us-gaap_CostOfGoodsSold	38,229us-gaap_CostOfGoodsSold	41,558us-gaap_CostOfGoodsSold
Services	7,219us-gaap_CostOfServices	6,806us-gaap_CostOfServices	5,084us-gaap_CostOfServices
Total cost of revenues	38,619us-gaap_CostOfRevenue	45,035us-gaap_CostOfRevenue	46,642us-gaap_CostOfRevenue
Gross profit	124,922us-gaap_GrossProfit	179,629us-gaap_GrossProfit	174,009us-gaap_GrossProfit
Operating expenses:
Engineering and product development	3,086us-gaap_ResearchAndDevelopmentExpense	3,306us-gaap_ResearchAndDevelopmentExpense	2,914us-gaap_ResearchAndDevelopmentExpense
Selling and marketing	107,169us-gaap_SellingAndMarketingExpense	127,528us-gaap_SellingAndMarketingExpense	116,487us-gaap_SellingAndMarketingExpense
General and administrative	35,711us-gaap_GeneralAndAdministrativeExpense	26,750us-gaap_GeneralAndAdministrativeExpense	27,330us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	145,966us-gaap_OperatingExpenses	157,584us-gaap_OperatingExpenses	146,731us-gaap_OperatingExpenses
(Loss) income from continuing operations before interest and other financing income (expense), net	(21,044)us-gaap_OperatingIncomeLoss	22,045us-gaap_OperatingIncomeLoss	27,278us-gaap_OperatingIncomeLoss
Interest and other financing income (expense), net	(4,387)us-gaap_NonoperatingIncomeExpense	702us-gaap_NonoperatingIncomeExpense	(351)us-gaap_NonoperatingIncomeExpense
(Loss) income from continuing operations before income taxes	(25,431)	22,747	26,927
Income tax expense	(36,312)us-gaap_IncomeTaxExpenseBenefit	(4,370)us-gaap_IncomeTaxExpenseBenefit	(4,438)us-gaap_IncomeTaxExpenseBenefit
(Loss) profit from continuing operations	(61,743)	18,377	22,489
Discontinued operations:
Loss from discontinued operations, net of taxes of $5,496	(15,155)	0	0
Estimated loss on sale from discontinued operations	(44,598)	0	0
Net (loss) income	(121,496)us-gaap_NetIncomeLoss	18,377us-gaap_NetIncomeLoss	22,489us-gaap_NetIncomeLoss
Basic net (loss) income per share:
Continuing operations (in dollars per share)	$ (3.25)	$ 0.90	$ 1.10
Discontinued operations (in dollars per share)	$ (3.16)	$ 0	$ 0
Basic (in dollars per share)	$ (6.41)us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic	$ 1.10us-gaap_EarningsPerShareBasic
Diluted net (loss) income per share:
Continuing operations (in dollars per share)	$ (3.25)	$ 0.89	$ 1.08
Discontinued operations (in dollars per share)	$ (3.16)	$ 0	$ 0
Diluted (in dollars per share)	$ (6.41)us-gaap_EarningsPerShareDiluted	$ 0.89us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted
Shares used in computing net income (loss) per share:
Basic (in shares)	18,940,355	20,454,970	20,355,520
Diluted (in shares)	18,940,355	20,657,240	20,764,354
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,052)	678	859
Comprehensive (loss) income	$ (123,548)us-gaap_ComprehensiveIncomeNetOfTax	$ 19,055us-gaap_ComprehensiveIncomeNetOfTax	$ 23,348us-gaap_ComprehensiveIncomeNetOfTax

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