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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 85,086us-gaap_CashAndCashEquivalentsAtCarryingValue $ 111,897us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 24,475us-gaap_HeldToMaturitySecuritiesCurrent 25,263us-gaap_HeldToMaturitySecuritiesCurrent
Prepaid expenses and other current assets 1,721us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,684us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 111,282us-gaap_AssetsCurrent 138,844us-gaap_AssetsCurrent
Property and equipment, net 218us-gaap_PropertyPlantAndEquipmentNet 123us-gaap_PropertyPlantAndEquipmentNet
Ownership interests in and advances to partner companies 165,421us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 154,192us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Loan participations receivable 3,851us-gaap_NotesAndLoansReceivableNetNoncurrent 3,855us-gaap_NotesAndLoansReceivableNetNoncurrent
Long-term marketable securities 20,657us-gaap_HeldToMaturitySecuritiesNoncurrent 19,365us-gaap_HeldToMaturitySecuritiesNoncurrent
Other assets 2,009us-gaap_OtherAssetsNoncurrent 2,075us-gaap_OtherAssetsNoncurrent
Total Assets 303,438us-gaap_Assets 318,454us-gaap_Assets
Current Liabilities:    
Accounts payable 227us-gaap_AccountsPayableCurrent 226us-gaap_AccountsPayableCurrent
Accrued compensation and benefits 1,688us-gaap_EmployeeRelatedLiabilitiesCurrent 3,997us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued expenses and other current liabilities 3,055us-gaap_AccruedLiabilitiesCurrent 2,334us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 4,970us-gaap_LiabilitiesCurrent 6,557us-gaap_LiabilitiesCurrent
Other long-term liabilities 3,558us-gaap_OtherLiabilitiesNoncurrent 3,507us-gaap_OtherLiabilitiesNoncurrent
Convertible senior debentures 50,850us-gaap_ConvertibleDebtNoncurrent 50,563us-gaap_ConvertibleDebtNoncurrent
Total Liabilities 59,378us-gaap_Liabilities 60,627us-gaap_Liabilities
Commitments and contingencies      
Equity:    
Preferred stock, $0.10 par value; 1,000 shares authorized 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.10 par value; 83,333 shares authorized; 21,573 shares issued at March 31, 2015 and December 31, 2014 2,157us-gaap_CommonStockValue 2,157us-gaap_CommonStockValue
Additional paid-in capital 819,423us-gaap_AdditionalPaidInCapitalCommonStock 819,757us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost; 865 and 921 shares at March 31, 2015 and December 31, 2014, respectively (18,171)us-gaap_TreasuryStockValue (19,341)us-gaap_TreasuryStockValue
Accumulated deficit (559,349)us-gaap_RetainedEarningsAccumulatedDeficit (544,746)us-gaap_RetainedEarningsAccumulatedDeficit
Total Equity 244,060us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 257,827us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Equity $ 303,438us-gaap_LiabilitiesAndStockholdersEquity $ 318,454us-gaap_LiabilitiesAndStockholdersEquity