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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net sales    
Laboratory service revenue $ 4,266us-gaap_SalesRevenueServicesNet  
License fees   294us-gaap_LicensesRevenue
Total revenue 4,266us-gaap_SalesRevenueNet 294us-gaap_SalesRevenueNet
Cost of sales 4,212us-gaap_CostOfRevenue  
Gross margin 54us-gaap_GrossProfit 294us-gaap_GrossProfit
Operating expenses:    
Research and development 6,571us-gaap_ResearchAndDevelopmentExpense 7,430us-gaap_ResearchAndDevelopmentExpense
General and administrative 12,971us-gaap_GeneralAndAdministrativeExpense 4,586us-gaap_GeneralAndAdministrativeExpense
Sales and marketing 16,524us-gaap_SellingAndMarketingExpense 4,456us-gaap_SellingAndMarketingExpense
Total operating expenses 36,066us-gaap_OperatingExpenses 16,472us-gaap_OperatingExpenses
Loss from operations (36,012)us-gaap_OperatingIncomeLoss (16,178)us-gaap_OperatingIncomeLoss
Other income (expense)    
Investment income 222us-gaap_InvestmentIncomeInterest 86us-gaap_InvestmentIncomeInterest
Interest expense (11)us-gaap_InterestExpense (15)us-gaap_InterestExpense
Total other income 211us-gaap_NonoperatingIncomeExpense 71us-gaap_NonoperatingIncomeExpense
Net loss $ (35,801)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (16,107)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss per share-basic and diluted (in dollars per share) $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted $ (0.23)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding-basic and diluted (in shares) 88,662us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 70,987us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted