Goodwill and Intangible Assets, Net - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2019	Feb. 28, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Finite-lived intangible assets:
Milestone payment accrued for FDA approval of Vyleesi			$ 60,000,000		$ 60,000,000		$ 0
Fair value of intangible asset			191,789,000		191,789,000		217,033,000
Impairment of intangible assets			77,358,000	$ 0	$ 77,358,000	$ 0
Expected useful life					8 years 9 months 18 days
Amortization of intangible assets					$ 7,900,000	$ 113,800,000
Vyleesi Products | Developed Technology Rights
Finite-lived intangible assets:
Fair value of intangible asset			60,000,000		60,000,000		0
Makena base technology | Developed Technology Rights
Finite-lived intangible assets:
Fair value of intangible asset			0		0		$ 77,359,000
Palatin Technologies, Inc.
Finite-lived intangible assets:
Payments related to collaborative arrangement		$ 60,000,000.0
Palatin Technologies, Inc. | Regulatory Milestone Achievement, U.S.Food And Drug Administration Approval | Vyleesi Products
Finite-lived intangible assets:
Milestone payment accrued for FDA approval of Vyleesi			$ 60,000,000.0		$ 60,000,000.0
Palatin Technologies, Inc. | Regulatory Milestone Achievement, U.S.Food And Drug Administration Approval | Subsequent Event | Vyleesi Products
Finite-lived intangible assets:
Payments related to collaborative arrangement	$ 60,000,000.0