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Share-based Compensation - Performance-Based Restricted Stock Units - Additional Information (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Share-based compensation Expense
Share-based compensation expense		$ 100,977	$ 105,357	$ 83,917
Cost of goods manufactured and sold
Share-based compensation Expense
Share-based compensation expense		9,948	9,174	7,596
Research and development
Share-based compensation Expense
Share-based compensation expense		29,924	32,943	22,635
Selling, general and administrative
Share-based compensation Expense
Share-based compensation expense		$ 61,105	$ 63,240	$ 53,686
Performance-based RSUs
Share-based compensation Expense
Number of Phase 3 studies of ALKS 3831 | item		2
Number of years from the date of the grant		3 years
Share-based compensation expense	$ 17,100
Expiration period		3 years
Unrecognized compensation cost		$ 29,800
Performance-based RSUs | Cost of goods manufactured and sold
Share-based compensation Expense
Share-based compensation expense	2,100
Performance-based RSUs | Research and development
Share-based compensation Expense
Share-based compensation expense	6,700
Performance-based RSUs | Selling, general and administrative
Share-based compensation Expense
Share-based compensation expense	$ 8,300

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