License Fee Payable (Details) - USD ($)	Mar. 18, 2019	Mar. 01, 2018	Sep. 30, 2019	Dec. 31, 2018	Feb. 28, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percent of counterparty payable offset by guarantor		50.00%			50.00%
Proceeds from milestone payments		$ 6,100,000
License fee payment		$ 5,600,000
License fees payable	$ 8,100,000
License fees	5,400,000		$ 0	$ 5,400,000
License fees payable, noncurrent	$ 2,700,000		0	$ 2,700,000
Accounts Receivable
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License fees			$ 4,500,000
License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percent of royalties payable under license agreement	90.00%
Third Party Licensee
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 9,000,000.0
SWK Funding LLC | SWK Purchase Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percent of royalties payable under license agreement	10.00%
EBS
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 1,800,000
NARCAN
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Minimum sales requirement for milestone payment	200,000,000
Milestone payment to be received if requirements are met	15,000,000
NARCAN | License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payment to be received if requirements are met	13,500,000
Adapt | SWK Purchase Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payment to be received if requirements are met	$ 2,700,000