Commitments and Contingencies - Additional Information (Details)					1 Months Ended	2 Months Ended	3 Months Ended	9 Months Ended
	Jun. 05, 2018 plaintiff	Jan. 30, 2018 USD ($)	Sep. 25, 2017 USD ($) claim	Sep. 22, 2017 USD ($)	Jul. 31, 2016 USD ($)	Mar. 31, 2014 plaintiff	Sep. 30, 2016 USD ($)	Sep. 30, 2018 USD ($)
JUXTAPID | Illegal Promotion and Violation of Code of Conduct | Brazil
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party					$ 500,000
Payments for legal settlements							$ 500,000
Suspension of membership period (in days)					180 days
Loss contingency recognized in period								$ 0
Qui Tam Litigation
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiff	2
Aegerion | SEC litigation | JUXTAPID
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 4,100,000
Litigation settlement, payable period (in years)			3 years
Litigation settlement, interest rate over unpaid balance percentage			1.75%
Current liability								900,000
Non-current liability								900,000
Aegerion | DOJ Plea Agreement
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party		$ 7,200,000
Litigation settlement, payable period (in years)		3 years
Litigation settlement, interest rate over unpaid balance percentage		1.75%
Current liability								2,200,000
Non-current liability								2,700,000
Litigation settlement, probation period (in years)		3 years
Loss contingency, number of misdemeanors | claim			2
Aegerion | DOJ Plea Agreement | JUXTAPID
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party				$ 28,800,000
Litigation settlement, payable period (in years)				3 years
Current liability								7,100,000
Non-current liability								$ 19,000,000.0
Aegerion | DOJ Plea Agreement | JUXTAPID | Medicaid Expenses
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party				$ 2,700,000
Aegerion | State Settlement Agreement | Medicaid Expenses
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party				2,700,000
Aegerion | State Settlement Agreement | JUXTAPID
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party				$ 28,800,000
Former Executive Officer | Qui Tam Litigation
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiff						2