Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Product sales, net	$ 38,413us-gaap_SalesRevenueGoodsNet	$ 40,096us-gaap_SalesRevenueGoodsNet
License fees and service revenue	205us-gaap_LicenseAndServicesRevenue	28us-gaap_LicenseAndServicesRevenue
Total revenues	38,618us-gaap_SalesRevenueNet	40,124us-gaap_SalesRevenueNet
Operating costs and expenses:
Cost of product sales (excludes amortization of intangible assets)	7,071	6,278
Selling, general and administrative	23,335	23,403
Research and development	15,851us-gaap_ResearchAndDevelopmentExpense	29,497us-gaap_ResearchAndDevelopmentExpense
Amortization and impairment of intangible assets	14,022us-gaap_CostOfGoodsSoldAmortization	5,360us-gaap_CostOfGoodsSoldAmortization
Total costs and operating expenses	60,279us-gaap_CostsAndExpenses	64,538us-gaap_CostsAndExpenses
Loss from operations	(21,661)us-gaap_OperatingIncomeLoss	(24,414)us-gaap_OperatingIncomeLoss
Other expenses:
Interest expense, net	(2,228)us-gaap_InterestIncomeExpenseNet	(2,067)us-gaap_InterestIncomeExpenseNet
Change in fair value of contingent consideration related to acquisitions	(500)	(724)
Other expense, net	(1,035)us-gaap_OtherNonoperatingIncomeExpense	(358)us-gaap_OtherNonoperatingIncomeExpense
Total other expenses	(3,763)us-gaap_NonoperatingIncomeExpense	(3,149)us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(25,424)	(27,563)
Provision for income taxes	(138)us-gaap_IncomeTaxExpenseBenefit	(78)us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (25,562)us-gaap_ProfitLoss	$ (27,641)us-gaap_ProfitLoss
Net loss per share:
Basic and diluted ($ per share)	$ (0.39)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.44)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding:
Basic and diluted (shares)	64,880,677	63,447,309

Change Of Business Acquisition Contingent Consideration At Fair Value

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Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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