Acquisition of Zogenix International Limited - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 24, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Change in fair value of contingent consideration		$ 1,800	$ (2,000)	$ 0
Zogenix International Limited [Member]
Business Acquisition [Line Items]
Cash paid in purchase	$ 20,000
Issuance of common stock in conjunction with acquisition, shares	11,995,202
Aggregate amount of contingent liabilities	$ 95,000
Aggregate purchase price	88,234
Issuance of common stock in conjunction with acquisition	15,200
Contingent purchase consideration for milestones	53,000
Transaction costs			$ 300
Zogenix International Limited [Member] | Contingent Consideration [Member]
Business Acquisition [Line Items]
Contingent purchase consideration for milestones	$ 53,000