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Certain Balance Sheet Items - Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of Accrued Expenses    
Accrued outsourced research and development $ 4,936halo_AccruedOutsourcedResearchAndDevelopmentExpensesCurrent $ 4,383halo_AccruedOutsourcedResearchAndDevelopmentExpensesCurrent
Accrued compensation and payroll taxes 3,079us-gaap_EmployeeRelatedLiabilitiesCurrent 5,923us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued outsourced manufacturing expenses 1,810halo_Accruedmanufacturingexpenses 2,112halo_Accruedmanufacturingexpenses
Other accrued expenses 3,510us-gaap_OtherAccruedLiabilitiesCurrent 2,023us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses 13,335us-gaap_AccruedLiabilitiesAndOtherLiabilities 14,441us-gaap_AccruedLiabilitiesAndOtherLiabilities
Long-term accrued outsourced research and development 522halo_AccruedOutsourcedResearchandDevelopmentExpensesLongTerm 480halo_AccruedOutsourcedResearchandDevelopmentExpensesLongTerm
Total accrued expenses, current $ 12,813us-gaap_AccruedLiabilitiesCurrent $ 13,961us-gaap_AccruedLiabilitiesCurrent