License Fee Payable (Details) - USD ($)	Mar. 18, 2019	Mar. 01, 2018	Dec. 31, 2018	Feb. 28, 2018	Dec. 31, 2017	Jul. 31, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of counterparty payable offset by guarantor				50.00%
Proceeds from milestone payments		$ 6,100,000
License fee payment		5,600,000
License fees			$ 5,400,000		$ 0	$ 0
License fees			$ 2,700,000		$ 0	$ 0
Adapt
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Reduction in Milestone Payment		$ 6,250,000
Subsequent Event
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees payable	$ 8,100,000
License fees	5,400,000
License fees	$ 2,700,000
Subsequent Event | License Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of royalties payable under license agreement	90.00%
Subsequent Event | Adapt | SWK Purchase Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 6,500,000.0
Milestone payment to be received if requirements are met	2,700,000
Subsequent Event | Third Party Licensee
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 9,000,000.0
Subsequent Event | SWK Funding LLC | SWK Purchase Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of royalties payable under license agreement	10.00%
Subsequent Event | EBS
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 1,800,000
Subsequent Event | EBS | SWK Purchase Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	2,000,000.0
Milestone payment to be received if requirements are met	2,500,000
Subsequent Event | Narcan
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Minimum sales requirement for milestone payment	200,000,000
Milestone payment to be received if requirements are met	15,000,000
Subsequent Event | Narcan | License Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Milestone payment to be received if requirements are met	$ 13,500,000