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CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and Cash Equivalents $ 122,170us-gaap_CashAndCashEquivalentsAtCarryingValue $ 28,020us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable Securities 237,603us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 173,023us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Accounts and Other Receivables 679us-gaap_AccountsAndOtherReceivablesNetCurrent 427us-gaap_AccountsAndOtherReceivablesNetCurrent
Prepaid and Other Current Assets 3,677us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,515us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 364,129us-gaap_AssetsCurrent 204,985us-gaap_AssetsCurrent
Property and Equipment, Net 11,236us-gaap_PropertyPlantAndEquipmentNet 10,535us-gaap_PropertyPlantAndEquipmentNet
Intangible Assets, Net 21,554us-gaap_IntangibleAssetsNetExcludingGoodwill 21,807us-gaap_IntangibleAssetsNetExcludingGoodwill
Other Assets 1,816us-gaap_OtherAssetsNoncurrent 1,722us-gaap_OtherAssetsNoncurrent
Goodwill 8,965us-gaap_Goodwill 8,965us-gaap_Goodwill
Total Assets 407,700us-gaap_Assets 248,014us-gaap_Assets
Current Liabilities:    
Accounts Payable 3,071us-gaap_AccountsPayableCurrent 2,603us-gaap_AccountsPayableCurrent
Accrued Expenses 15,420us-gaap_AccruedLiabilitiesCurrent 19,296us-gaap_AccruedLiabilitiesCurrent
Current Portion of Long-Term Liabilities 2,657us-gaap_OtherLiabilitiesCurrent 2,592us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities 21,148us-gaap_LiabilitiesCurrent 24,491us-gaap_LiabilitiesCurrent
Other Long-Term Liabilities 11,000us-gaap_OtherLiabilitiesNoncurrent 11,863us-gaap_OtherLiabilitiesNoncurrent
Total Liabilities 32,148us-gaap_Liabilities 36,354us-gaap_Liabilities
Commitments and Contingent Liabilities      
Stockholders' Equity:    
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at March 31, 2015 and December 31, 2014      
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 98,480,632 and 89,592,779 Shares Issued and Outstanding at March 31, 2015 and December 31, 2014, respectively 98us-gaap_CommonStockValue 90us-gaap_CommonStockValue
Additional Paid-In Capital 866,771us-gaap_AdditionalPaidInCapitalCommonStock 672,739us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated Other Comprehensive Income 2,616us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,590us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated Deficit (493,933)us-gaap_RetainedEarningsAccumulatedDeficit (463,759)us-gaap_RetainedEarningsAccumulatedDeficit
Total Stockholders' Equity 375,552us-gaap_StockholdersEquity 211,660us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity $ 407,700us-gaap_LiabilitiesAndStockholdersEquity $ 248,014us-gaap_LiabilitiesAndStockholdersEquity