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Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 699,997us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 653,896us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credits 73,227us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 70,091us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Capitalized research 28,516mnkd_DeferredTaxAssetsCapitalizedResearchExpenses 30,421mnkd_DeferredTaxAssetsCapitalizedResearchExpenses
Payments from collaboration 19,217us-gaap_DeferredTaxAssetsDeferredIncome  
Milestone Rights 5,321mnkd_DeferredTaxAssetsMilestoneRights 6,608mnkd_DeferredTaxAssetsMilestoneRights
Accrued expenses 768us-gaap_DeferredTaxAssetsTaxDeferredExpense 3,578us-gaap_DeferredTaxAssetsTaxDeferredExpense
Non-qualified stock option expense 43,691us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 41,219us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Capitalized patent costs 8,624mnkd_DeferredTaxAssetsCapitalizedCosts 7,811mnkd_DeferredTaxAssetsCapitalizedCosts
Other 131us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 837us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Depreciation 3,010us-gaap_DeferredTaxAssetsOther 2,539us-gaap_DeferredTaxAssetsOther
Total net deferred tax assets 882,502us-gaap_DeferredTaxAssetsGross 817,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (882,502)us-gaap_DeferredTaxAssetsValuationAllowance (817,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet