Commitments and Contingencies (Details) shares in Millions								12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 13, 2019 USD ($)	Aug. 16, 2019 USD ($)	Jul. 25, 2019 USD ($) shares	Feb. 20, 2019 USD ($)	Sep. 05, 2018 USD ($)	Apr. 07, 2017 USD ($)	Dec. 31, 2018 USD ($)
Contingent Potential Milestone Payments, Year ending December 31,
2019	$ 121,000
2020	2,099,000
2021	2,150,000
2022	550,000
Total	4,920,000
Akorn, Inc v. Fresenius
Contingent Potential Milestone Payments, Year ending December 31,
Damages sought			$ 123,000,000		$ 102,000,000
Date Integrity Securities Litigation, First Occurrence
Contingent Potential Milestone Payments, Year ending December 31,
Damages sought						$ 1,070,000,000.00
Date Integrity Securities Litigation, Second Occurrence
Contingent Potential Milestone Payments, Year ending December 31,
Damages sought						$ 613,000,000
Ann Pope And Anthony Pope v. Horatio V. Cabasares M.D.P.C. Houston Healthcare Systems Inc. Akorn Sales Inc. and Akorn Inc. [Member]
Contingent Potential Milestone Payments, Year ending December 31,
Damages sought							$ 20,500,000
Loss contingency liability								$ 20,500,000
Insurance settlements receivable								8,800,000
Proceeds received from insurance carrier								$ 8,800,000
Payments paid to plaintiffs		$ 24,000,000
Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency, number of shares to be issued (shares) | shares				6.5
Contingent value rights, duration of term				5 years
Contingent value rights, extension term				2 years
Percentage of excess EBITDA				33.30%
Loss contingency, EBITDA net leverage ratio				3.0
Contingent value rights, minimum cash cushion				$ 100,000,000.0
Contingent value rights, aggregate cap per year				12,000,000.0
Contingent value rights, aggregate cap per term				60,000,000.0
Loss contingency liability	74,000,000.0
Loss contingency, effect of 10% change in common stock price on reserve estimate				3,100,000
Decrease in loss contingency accrual	12,000,000.0
Payment of Insurance Proceeds | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency, estimate of possible loss				30,000,000.0
Contingent Value Rights, Change of Control Payment | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency, estimate of possible loss				30,000,000.0
Contingent Value Rights, Bankruptcy Claim | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency, estimate of possible loss				30,000,000.0
Contingent Value Rights, Contingent Cash Payments | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency liability	30,000,000.0
Liability to Issue Common Stock, Noncurrent | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency liability	8,500,000
Liability to Issue Common Stock, Current | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency liability	$ 35,500,000
Possible Loss In Excess Of Estimated Liability | Securities Class Action Litigation
Contingent Potential Milestone Payments, Year ending December 31,
Loss contingency, estimate of possible loss				$ 30,000,000.0