CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
REVENUE:
Product sales	$ 79,367us-gaap_SalesRevenueGoodsNet	$ 73,695us-gaap_SalesRevenueGoodsNet
Services and other	9,350us-gaap_OtherSalesRevenueNet	9,276us-gaap_OtherSalesRevenueNet
Total revenue	88,717us-gaap_SalesRevenueNet	82,971us-gaap_SalesRevenueNet
COSTS AND EXPENSES:
Cost of product sales	27,583us-gaap_CostOfGoodsSold	29,512us-gaap_CostOfGoodsSold
Cost of services and other	6,296us-gaap_CostOfServices	6,904us-gaap_CostOfServices
Research and development	12,120us-gaap_ResearchAndDevelopmentExpense	11,635us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	35,433	38,562
Litigation settlement	0us-gaap_LitigationSettlementExpense	5,100us-gaap_LitigationSettlementExpense
Total costs and expenses	81,432us-gaap_CostsAndExpenses	91,713us-gaap_CostsAndExpenses
Income (loss) from operations	7,285us-gaap_OperatingIncomeLoss	(8,742)us-gaap_OperatingIncomeLoss
Other (expense) income, net	(673)us-gaap_NonoperatingIncomeExpense	293us-gaap_NonoperatingIncomeExpense
Interest expense	1,483us-gaap_InterestExpense	1,753us-gaap_InterestExpense
Income (loss) before income taxes	5,129	(10,202)
Income tax provision	743us-gaap_IncomeTaxExpenseBenefit	272us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ 4,386us-gaap_NetIncomeLoss	$ (10,474)us-gaap_NetIncomeLoss
Basic net income (loss) per common share	$ 0.06us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per common share	$ 0.06us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted
Shares used in computing basic net income (loss) per common share	75,408	72,498
Shares used in computing diluted net income (loss) per common share	78,754	72,498

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