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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Product revenues, net	$ 149,745	$ 136,709	$ 135,546	$ 144,767	$ 129,620	$ 127,013	$ 123,549	$ 83,751	$ 566,767	$ 463,933	$ 276,868
Belbuca
Disaggregation of Revenue
Product revenues, net									182,095	126,461
Xtampza ER
Disaggregation of Revenue
Product revenues, net									177,374	138,804	103,708
Nucynta IR
Disaggregation of Revenue
Product revenues, net									108,150	112,058	102,222
Nucynta ER
Disaggregation of Revenue
Product revenues, net									82,653	72,418	$ 70,938
Symproic
Disaggregation of Revenue
Product revenues, net									$ 16,495	12,267
Other
Disaggregation of Revenue
Product revenues, net										$ 1,925

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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