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Consolidated Balance Sheet Details - Other Long-Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Interest expense payable, less current portion	$ 0zgnx_InterestExpenseNoncurrent	$ 5,901zgnx_InterestExpenseNoncurrent
Deferred Rent	664us-gaap_DeferredRentCreditNoncurrent	77us-gaap_DeferredRentCreditNoncurrent
Embedded derivatives	0us-gaap_DerivativeLiabilitiesNoncurrent	233us-gaap_DerivativeLiabilitiesNoncurrent
Other long-term liabilities	389	285
Total other long-term liabilities	$ 1,053us-gaap_OtherLiabilitiesNoncurrent	$ 6,496us-gaap_OtherLiabilitiesNoncurrent

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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