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Subsequent Events (Notes)	6 Months Ended
Subsequent Events (Notes)	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 1, 2017, Zogenix and Durect Corporation (“Durect”) entered into an agreement to terminate the development and license agreement related to Relday. Under the terms of the termination agreement, all of the Company’s development and commercialization rights related to Relday were returned to Durect and all regulatory filings and development information related to Relday will be assigned and/or transferred to Durect. Upon termination, the Company has no further obligations to make any potential future milestone payments with respect to Relday. In addition, the termination agreement does not provide the Company with any future royalty entitlements.