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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 $ 568,636us-gaap_CashAndCashEquivalentsAtCarryingValue $ 502,677us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivable from collaboration partner 126,613mdvn_ReceivableFromCollaborationPartner 184,737mdvn_ReceivableFromCollaborationPartner
Deferred income tax assets 20,035us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 21,987us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid expenses and other current assets 12,821us-gaap_PrepaidExpenseAndOtherAssetsCurrent 12,264us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Restricted cash 930us-gaap_RestrictedCashAndInvestmentsCurrent 203us-gaap_RestrictedCashAndInvestmentsCurrent
Total current assets 729,035us-gaap_AssetsCurrent 721,868us-gaap_AssetsCurrent
Property and equipment, net 42,031us-gaap_PropertyPlantAndEquipmentNet 41,161us-gaap_PropertyPlantAndEquipmentNet
Intangible assets 101,000us-gaap_IntangibleAssetsNetExcludingGoodwill 101,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred income tax assets, non-current 18,531us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 15,176us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Restricted cash, net of current 12,409us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 11,562us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Goodwill 10,000us-gaap_Goodwill 10,000us-gaap_Goodwill
Other non-current assets 11,845us-gaap_OtherAssetsNoncurrent 10,852us-gaap_OtherAssetsNoncurrent
Total assets 924,851us-gaap_Assets 911,619us-gaap_Assets
Current liabilities:    
Accounts payable, accrued expenses and other current liabilities 91,965us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent 106,132us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
Contingent consideration 10,000us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent 10,000us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Deferred revenue 1,411us-gaap_DeferredRevenueCurrent 2,822us-gaap_DeferredRevenueCurrent
Current portion of build-to-suit lease obligation 469mdvn_BuildToSuitLeaseObligationCurrent 698mdvn_BuildToSuitLeaseObligationCurrent
Total current liabilities 103,845us-gaap_LiabilitiesCurrent 119,652us-gaap_LiabilitiesCurrent
Convertible Notes, net of unamortized discount of $32,993 and $36,598 at March 31, 2015 and December 31, 2014, respectively 225,007us-gaap_ConvertibleLongTermNotesPayable 222,140us-gaap_ConvertibleLongTermNotesPayable
Contingent consideration 100,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent 96,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Build-to-suit lease obligation, excluding current portion 19,240mdvn_BuildToSuitLeaseObligationNonCurrent 18,711mdvn_BuildToSuitLeaseObligationNonCurrent
Other non-current liabilities 5,705us-gaap_OtherLiabilitiesNoncurrent 5,817us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 453,797us-gaap_Liabilities 462,320us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders' equity:    
Preferred stock, $0.01 par value per share; 1,000,000 shares authorized; no shares issued and outstanding      
Common stock, $0.01 par value per share; 170,000,000 shares authorized; 78,621,483 and 78,117,227 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively 786us-gaap_CommonStockValue 781us-gaap_CommonStockValue
Additional paid-in capital 531,095us-gaap_AdditionalPaidInCapital 506,227us-gaap_AdditionalPaidInCapital
Accumulated deficit (60,827)us-gaap_RetainedEarningsAccumulatedDeficit (57,709)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 471,054us-gaap_StockholdersEquity 449,299us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 924,851us-gaap_LiabilitiesAndStockholdersEquity $ 911,619us-gaap_LiabilitiesAndStockholdersEquity