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Consolidated Balance Sheet Details - Inventory, Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 3,453us-gaap_InventoryRawMaterialsNetOfReserves $ 2,770us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 7,998us-gaap_InventoryWorkInProcessNetOfReserves 6,054us-gaap_InventoryWorkInProcessNetOfReserves
Carrying value of Sumavel DosePro inventory on hand at Closing 972us-gaap_InventoryFinishedGoodsNetOfReserves 1,112us-gaap_InventoryFinishedGoodsNetOfReserves
Deferred cost of goods sold 1,016zgnx_InventoryDeferredCostofGoodSoldNetofReserves 0zgnx_InventoryDeferredCostofGoodSoldNetofReserves
Inventory, net $ 13,439us-gaap_InventoryNet $ 9,936us-gaap_InventoryNet