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Certain Balance Sheet Items Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Revenue    
Deferred revenue $ 54,634us-gaap_DeferredRevenue $ 53,143us-gaap_DeferredRevenue
Deferred revenue, current portion 7,367us-gaap_DeferredRevenueCurrent 7,398us-gaap_DeferredRevenueCurrent
Deferred revenue, net of current portion 47,267us-gaap_DeferredRevenueNoncurrent 45,745us-gaap_DeferredRevenueNoncurrent
Collaborative agreements    
Deferred Revenue    
Deferred revenue 53,479us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= us-gaap_CollaborativeArrangementMember
51,185us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= us-gaap_CollaborativeArrangementMember
Product sales    
Deferred Revenue    
Deferred revenue $ 1,155us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= halo_ProductSalesMember
$ 1,958us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= halo_ProductSalesMember