Organization, Basis of Presentation and Liquidity	6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Basis of Presentation and Going Concern	Organization, Basis of Presentation and Going Concern Organization Zogenix, Inc. and its wholly-owned subsidiaries (the “Company”) is a pharmaceutical company committed to developing and commercializing central nervous system (CNS) therapies. The Company’s current primary area of focus is orphan or rare childhood-onset epilepsy disorders and its lead product candidate is ZX008. ZX008 is currently being developed for the treatment of seizures associated with Dravet syndrome and Lennox-Gastaut Syndrome, or LGS. In addition, the Company performed contract manufacturing services under a supply agreement through April 2017 (see Note 5). The Company operates in one business segment—the research, development and commercialization of pharmaceutical products and its headquarters are located in Emeryville, California. In April 2015, the Company divested its Zohydro ER® business. Zohydro ER activity has been excluded from continuing operations for all periods herein and reported as discontinued operations. Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of Zogenix, Inc. and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting. In the opinion of management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The results of operations for any interim period are not necessarily indicative of results of operations for any future period. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted. Accordingly, these unaudited interim condensed consolidated financial statements and accompanying notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 as filed with the SEC on March 9, 2017. Going Concern The accompanying condensed consolidated financial statements have been prepared under the assumption that the Company will continue as a going concern. Such assumption contemplates the realization of assets and satisfaction of liabilities in the normal course of business. Excluding gains from two discrete business divestitures, the Company has incurred recurring net losses and continuing negative cash flows from its operations resulting in an accumulated deficit of $489.5 million as of June 30, 2017. At June 30, 2017, the Company had cash and cash equivalents of $65.8 million. Management anticipates further operating losses and negative cash flows from operations for at least the next year as the Company continues to incur costs related to its ongoing Phase 3 clinical trials of ZX008 in North America and the European Union (EU) in Dravet syndrome as well as the planned commencement of a Phase 3 clinical trial in LGS in the second half of 2017. Additionally, upon acceptance of the Company’s regulatory submissions for ZX008 by the U.S. Food and Drug Administration (FDA) or the European Medicines Agency (EMA), if at all, each a milestone event, the Company will owe milestone payments under an existing agreement in connection with the Company’s prior acquisition of ZX008. Based on the Company’s current operating plans, management believes that the Company’s existing cash and cash equivalents will not be sufficient to meet the Company's anticipated operating needs beyond the first half of 2018. As a result, management has concluded there is substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the accompanying condensed consolidated financial statements are issued. The accompanying condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or amounts and classification of liabilities that may result from the outcome of this uncertainty. The Company’s ability to continue as a going concern is dependent upon its ability to raise additional funding. Management intends to raise additional capital through public or private equity or debt financings and potentially through collaboration, licensing or other similar arrangements. However, the Company may not be able to secure such financing in a timely manner or on favorable terms, if at all. Furthermore, if the Company issues equity or debt securities to raise additional funds, its existing stockholders may experience dilution, and the new equity or debt securities may have rights, preferences and privileges senior to those of the Company’s existing stockholders. If the Company raises additional funds through collaboration, licensing or other similar arrangements, it may be necessary to relinquish valuable rights to its potential products or proprietary technologies, or grant licenses on terms that are not favorable to the Company. Without additional funds, the Company may be forced to delay, scale back or eliminate some of its research and development activities, or other operations and potentially delay product development in an effort to provide sufficient funds to continue its operations. If any of these events occur, the Company’s ability to achieve the development and commercialization goals could be adversely affected.

Organization, Basis of Presentation and Going Concern

Organization

Zogenix, Inc. and its wholly-owned subsidiaries (the “Company”) is a pharmaceutical company committed to developing and commercializing central nervous system (CNS) therapies. The Company’s current primary area of focus is orphan or rare childhood-onset epilepsy disorders and its lead product candidate is ZX008. ZX008 is currently being developed for the treatment of seizures associated with Dravet syndrome and Lennox-Gastaut Syndrome, or LGS. In addition, the Company performed contract manufacturing services under a supply agreement through April 2017 (see Note 5). The Company operates in one business segment—the research, development and commercialization of pharmaceutical products and its headquarters are located in Emeryville, California.

In April 2015, the Company divested its Zohydro ER® business. Zohydro ER activity has been excluded from continuing operations for all periods herein and reported as discontinued operations.

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts of Zogenix, Inc. and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting. In the opinion of management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The results of operations for any interim period are not necessarily indicative of results of operations for any future period. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted. Accordingly, these unaudited interim condensed consolidated financial statements and accompanying notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 as filed with the SEC on March 9, 2017.

Going Concern

The accompanying condensed consolidated financial statements have been prepared under the assumption that the Company will continue as a going concern. Such assumption contemplates the realization of assets and satisfaction of liabilities in the normal course of business.

Excluding gains from two discrete business divestitures, the Company has incurred recurring net losses and continuing negative cash flows from its operations resulting in an accumulated deficit of $489.5 million as of June 30, 2017. At June 30, 2017, the Company had cash and cash equivalents of $65.8 million. Management anticipates further operating losses and negative cash flows from operations for at least the next year as the Company continues to incur costs related to its ongoing Phase 3 clinical trials of ZX008 in North America and the European Union (EU) in Dravet syndrome as well as the planned commencement of a Phase 3 clinical trial in LGS in the second half of 2017. Additionally, upon acceptance of the Company’s regulatory submissions for ZX008 by the U.S. Food and Drug Administration (FDA) or the European Medicines Agency (EMA), if at all, each a milestone event, the Company will owe milestone payments under an existing agreement in connection with the Company’s prior acquisition of ZX008. Based on the Company’s current operating plans, management believes that the Company’s existing cash and cash equivalents will not be sufficient to meet the Company's anticipated operating needs beyond the first half of 2018. As a result, management has concluded there is substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the accompanying condensed consolidated financial statements are issued. The accompanying condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or amounts and classification of liabilities that may result from the outcome of this uncertainty.

The Company’s ability to continue as a going concern is dependent upon its ability to raise additional funding. Management intends to raise additional capital through public or private equity or debt financings and potentially through collaboration, licensing or other similar arrangements. However, the Company may not be able to secure such financing in a timely manner or on favorable terms, if at all. Furthermore, if the Company issues equity or debt securities to raise additional funds, its existing stockholders may experience dilution, and the new equity or debt securities may have rights, preferences and privileges senior to those of the Company’s existing stockholders. If the Company raises additional funds through collaboration, licensing or other similar arrangements, it may be necessary to relinquish valuable rights to its potential products or proprietary technologies, or grant licenses on terms that are not favorable to the Company. Without additional funds, the Company may be forced to delay, scale back or eliminate some of its research and development activities, or other operations and potentially delay product development in an effort to provide sufficient funds to continue its operations. If any of these events occur, the Company’s ability to achieve the development and commercialization goals could be adversely affected.