Intangible Assets - Costs Accumulated to Acquire Intangible Asset and Consideration Transferred (Details) - Nucynta Products - USD ($) $ in Thousands		6 Months Ended
	Feb. 06, 2020	Jun. 30, 2020
Acquisition consideration:
Base purchase price		$ 375,000
Cash paid for inventory		6,030
Transaction costs		6,297
Reduction for 2020 cash transferred to Assertio under the prior Nucynta Commercialization Agreement(1)		(13,071)
Reduction for accrued royalty obligation discharged upon closing(1)		(1,145)
Total acquisition consideration		373,111
Reduction to base purchase price		14,216
Consideration transferred to assets acquired:
Nucynta Intangible Asset		367,081
Inventory		6,030
Total consideration allocated to assets acquired		$ 373,111
Assertio | Nucynta Purchase Agreement
Finite-Lived Intangible Assets [Line Items]
Aggregate purchase price	$ 375,000